Yes players can start off as zombies or survivors. We had a turnout of about 50 during the Spring so I expect that amount of people to show up but not at the same time. The founders have been working since August to get people signed up so it should be really close to that number.
Some key rules differences are
* LARP friendly Foam Swords are the starting weapons
* Zombies can run
* If a Zombie gets hit by a weapon they have to tag a trash can to come back to life
* Zombies have to get a human in a hold for 5 seconds to transform them into a Zombie
* Game takes place in a 6 block radius