1) It's powered by a chipset that is rumored to be an NV Pascal chip. That's the same chip as in the GTX10xx series. In case you haven't been up on PC hardware lately, NV effectively stopped producing separate mobile chips and branding them differently because the GTX1060 / 1070 / 1080 use so little power as to be mobile chips, but with crazy performance. This could easily have a GTX1060-level-based chip in it, and it would get 50-80 FPS at 1080p ultra detail in modern games, putting it on par with Xbox One (non-Scorpio) / PS4 (non-Pro).
2) The need for parentheses above is SUPER important, and not as a diss on it. Why? Every other generation where Nintendo has launched a console 3 years later than its competition, the competition released a new console within the 6 months to a year after that was a generation ahead, new engines were developed to use that hardware, and they weren't able to be optimized for the poor old Nintendo hardware. That meant Nintendo only had third party support for a year.
But MS and Sony starting an upgradeable generation means that, while it's great for gamers on those systems, it's even BETTER for Nintendo. See, for once, MS and Sony are requiring games on their consoles to be compatible on one disc with both, with just better graphics on the higher end. That means engines have to be developed for the original Xbox One and PS4 hardware for the foreseeable future - hardware that Nintendo now has hardware on par with. That means third party games will be able to thrive on it performance-wise, and third parties won't have to shy away like Wii / Wii U.
3) Why else have third parties fled from Nintendo? Because you couldn't just make a port. The consoles didn't ship with controllers on par with the competition, they either required total redo or an add-on accessory few bought (Wii), or touchscreen added to not be lambasted in reviews that drive down metacritic score and sales (Wii U), which industry insiders have said publishers require to be a certain level or developers don't receive full money. Other than graphics, why did we see lots of ports between Xbox 360 / PS3 / PC and Xbox One / PS4 / PC, but not Wii / Wii U? Because no one wanted to invest the extra cost in "remastering" their game with special gimmick controls. Switch? No such problem. Look at the controller - it's a straight up Xbox One controller, the same standard used on PC and Xbox One, and nearly interchangeable with PS4 as far as buttons and inputs go. And there's no gimmicks to cause your game to bomb if you don't implement them, like using two screens no other consoles have, or implementing touch or motion. So while Nintendo may have those tricks up their sleeve, they're not selling on that, and reviewers will be basing their reviews accordingly, not penalizing ports for not doing anything special. It's on even expectation grounds as Xbox One / PS4, which means ports are easy, which means third party support.
4) Why else will it get third party support? Again, more standardization. Today, more than in the Wii era, games are built on a series of fewer and fewer middleware platforms, and almost (if not all) the biggies committed support today:
CryEngine is onboard
Unreal Engine 4 is onboard
Unity is onboard
Havok is onboard
EA didn't explicitly claim Frostbite support, but they showed FIFA 17, which is built on Frostbite. Unless they're doing a special one-and-done version on a different engine, EA is on board.
The only major engines I can think of that haven't confirmed yet are the idtech engines (though Bethesda, now owner of the tech, showed they are standing behind it with Skyrim, so that's likely in the future), and Source (if you look at the list of Source games in the last few years, it's becoming niche and isn't a major player anymore).
Together, 2-4 are HUGE. If engine and middleware support is there, hardware is on par with other consoles, and controls don't require special handling to port, the third party ecosystem has little reason not to be there as long as it sells. The death knell of the Wii (after the novelty wore off) and the Wii U (from the beginning), not enough quality games outside of Nintendo first parties, becomes a non-issue and gives this thing legs. But there's more...
5) Can you say more amazing first party games? And I don't mean like "of course, new console, there will be new games." I mean MORE games. Nintendo doesn't have to split its first and second party studios into portable and console teams anymore. Those studios can make double the games now, since they're writing for both the portable and home system in one release. This could mean a return of franchises that we've seen die off, e.g Metroid Prime - those games were incredibly big to make, and what happened when Nintendo had to split that team into two? We got simpler Donkey Kong games that could be made on a reasonable schedule by smaller teams.
Where we don't see double the games, we'll see studios taking the same time to make CRAZY huge or polished games. See the new Zelda. Hint: Nintendo has only had to focus their core team capable of making a Zelda game on one game, not two games for different targets / markets.
6) Look at the design of the thing. Industrial, relatively fragile looking. This isn't a kid-marketed product. How many kids did you see in the release trailer? Oh, none? Nintendo is marketing this at adults. They know their market has grown up and kids are entertained by iPad and iPhone games now, and they've partnered with Apple and licensed to third party developers on that side to meet that "dumbed down" games need. Now they can focus on making broad-audience games, and they lose the "Nintendo is for kids; Sony and Microsoft are for real gamers" mass mentality that keeps their sales limited. Want more evidence? Skyrim Remastered. On a HANDHELD. Enjoy taking non-epic shits while you can, because once this drops, every break to take a deuce and play your handheld (don't lie, you do it with a 3DS now) will be accompanied by adventure and heroic questing. (I used to be an adventurer like you, but then I took an arrow... while... I... peed?)
7) That same "more focused on adults" marketing? If that stays a focus, they've solved the "but KIDS play on Nintendo! Won't somebody think of the kids?!" that has ruined their online play platforms by restricting communication between players to pre-approved, pre-made 20 character chat type communication bound to a d-pad for all online play. Nintendo has a real ID system in place now too, with the Nintendo ID, not janky friend codes. They have the pieces in play (if they ACTUALLY finally stop screwing up and lagging on the social part of gaming online in their system software) to build a network on par with PSN. I don't think they'll be as solid as XBL - Microsoft is just too strong in cloud services and collaboartion technology, but they could be on par with PSN, and for many (e.g. online FPS, etc.) that's good enough.
8) That screen is RIPE to be a touchscreen. In portable mode, we're talking ports of mobile games potentially. Watch Nintendo's bottom line go through the roof if that happens. It would also open the door for likely ability to do indie dev via an app store, if they're smart. I will say this is the least likely item on the list, if not for the fact of "how do you use the touchscreen if games are made for it while you've got it docked." But notice that the controllers can be used independently in the video. Take a CLOSE look at the bottom of the screen. See that dark spot? Dead giveaway of an IR receiver. Now look even more closely to the back of the controller halves, opposite side of the small button. See that pinhole? Too small to be a screwhole - if a screw that small was used, they'd just seal it. That's likely an IR emitter. That gives you positional relative tracking, ala a Wiimote, but in reverse (in Wii / Wii U, the sensor bar was the emitter, and the controllers were the camera. Here, it's the opposite. Now, as to how the controllers could judge direction when there's only one IR point to judge against, I'm not sure. That's where I say less likely for this one). But if that's true, then you could point when docked to use the controller in Wiimote style to activate touch functionality.
9 - bonus because apparently I can't count and I can't edit titles) Capacity isn't the death of this thing like N64 vs. PS1 (max 64 MB cartridges vs. FF8 at 2.6 GB potential storage across 4 650 MB discs, for MUCH chepaer to press a CD at a few cents than the 20+ bucks 64 MB flash cost back then), like Gamecube vs. PS2 / Xbox (1.x GB mini discs vs DVD at up to 9 GB), Wii vs. Xbox 360 / PS3 (9 GB DVD put it on par with Xbox 360, but far less than PS4's 25-50 GB BluRays), and even Wii U (25 GB custom disc media vs. PS4 and Xbox One using 50GB capable Blu-Ray).
Write-once Flash ROM is way cheaper than it used to be (as cheap as pressing a disc? No. But ridiculously expensive for 50GB? Also no.) As far as cartridges go, Nintendo can match the size needed for single games now for the first time with Sony and Microsoft since back when they were competing with Sega in the 16-bit era. Yet another reason we won't see third parties shying away, or gimped games because of Nintendo's short-sightedness.
And compared to Blu-Ray's maximum read speed of 27 MB/s on the PS4, flash ROM is capable of ridiciulously fast speeds. No need to wait for games to install from disc before you can play them. Nintendo could either go with cheap flash cards that are super high capacity - FAR bigger than their competition can do on a disc, or much faster cards and eliminate load times at more reasonable size for smaller games. This is a competitive advantage they've never had.
(Now, one area I am concerned about is digital download. While there are USB ports on the console base, obviously you undock it and lose storage, what happens? Game pauses? Console only lets you play a game from digital download if it's on the SD card, and when you launch it it does a quick sync over USB 3 from the hard drive? Unliekly. Those questions remain to be answered.)
Third party support being not only feasible, but likely? Check. Understanding their demographic has grown up? Check. Having the flexibility to take it on the go, or play it at home, to fit my older, more travel-filled lifecycle? Check. Ability to produce even more (or the same amount at even better quality / depth) of Nintendo's amazing first party games than before? Check.
If Nintendo doesn't screw up the digital distribution, pricing, or online gaming frameworks / limitations, they just took back the market for anyone that's not all about the "but all mah gamez MUST be in teh 4Ks!"
From now to March feels like an eternity again, for the first time since those 5 minutes on December 25, 1996, but this time, I couldn't be happier that time's moving so slow. If it's got my jaded self excited after all these years, then Nintendo's back, baby. It's about damn time.