Good question! I want to clear this one up so that everyone can feel good about the version of the game they fund. We have 14 characters currently designed (UPDATE and in the game now!). There is a difference now to make clear between total characters available and the number of players the game plays. We've found the game to work anywhere from 2 players all the way to 8 or more. (we added a 9 and 10 player card in the add ons)
UPDATE: We hit our first stretch goal, unlocking all of our designed characters. AND someone has backed at the top tier, meaning we're designing 1 more, for 15 total characters! If you are backing the standard edition game, you'll get 9 of those, and then 14 characters if you're in for a special edition copy. Finally, if you want our resident zombie, Undead Fred, he's available at "Catch of the Day" tier and above.
So the game always can play at least 2-8 players, but depending on what level you support and how far we go you may have between 9-15 characters in the box.
Thanks for your support! With your help, we're making this full cast of characters come out and play!