Based on the trailer it appears that most of the early reports of what the Zombieland sequel would be about were pretty accurate.
Based on those reports, it appears that Wilson’s character is named TB (possibly short for Tampa Bay) and Middleditch is named Cleveland.
The official plot synopsis also confirms something that had been rumored, but that is not made clear in the trailer, that the zombies have evolved since the first film, and so our heroes will be running up against all new types of the walking dead.