For now, essentially it's this. Imagine you start with 5 tokens.
You can place those on either getting the games you want or getting the side you want in particular games or a mixture.
Teams will rank in order the 5 optional games 1-5 with 1 being the one you want the most. Starting with the teams that put the most tokens on game selection, I'll start divying up teams into games. The team that places the most tokens into game selection will thus automatically get into all the games they want. Once it's impossible for me to put teams into their preferred games, I'll starting using their 4th picks until that's impossible. For every game you're placed in that wasn't in your top 3, you'll get a token back (up to a maximum of 5, so you can't gain more tokens than you started with)
After games have been selected for each team, each team will then submit what players they want to place in what games, and if they want to use a token on those games to influence the side selection.
Ignoring tokens, each player in each game will have a random number between 500 and 600 generated. The lowest numbers are mafia, the highest numbers are town. For each token you place to make a player mafia, it will lower the lower bound by 65. For each token you place on town it will raise the upper bound by 50. So a player that has a single token placed on mafia will generate a random value between 435 and 600 rather than 500 and 600, thus making it more likely he'll be scum. A player that has three tokens placed on town in a game will have a number generated between 500 and 750, thus making it significantly more likely a player will be town.
(Incidentally, the change for scum is higher than town because you need more of an extreme number to be scum given that most players are town).
So as an example. Let's say I have the Skittle Club Team with Zoraster, quadz08, mith and Vi.
We as a team want the Nightless, White Flag, Theme, Normal and 9p Open in that order. We rank that and decide that we're okay with most games, so we just put 1 token on it.
At game selection, we end up getting Nightless, Theme game and Normal. Because we had a pick that wasn't in our top 3, we get our token back, leaving us with 5 tokens for the game selection.
We decide that Vi is really good at scum and Zoraster is really good at town, so we decide to split our tokens between the two, putting 3 tokens on Vi for scum and 2 on Zoraster for town. In those games, rather than generating a number between 500 and 600, they'll generate between 305 and 600 for Vi and 500 and 700 for Zoraster. The other players on the team are simply generated between 500 and 600.