Zombies. Casino. Massacre. FTMFW. http://www.youtube.com/watch?v=d87f8pqEsU8 I am SOOOO there. Add some sort of co-op with that many zombies on the screen and I just might soil myself with glee. I don't think this is a fake either, as it's pretty slick and has some original lines from the Frank West voice actor. Given the social commentary behind George Romero's zombies, having a casino/Vegas type environment as a backdrop for DR2 would be sheer genius on Capcom's part.
Yup. Zombies + hamster ball = "Sources close to Capcom" indicate this leaked teaser is the real deal. Let's hope they're right! http://www.vg247.com/2009/02/06/source-leaked-dead-rising-2-trailer-is-the-real-deal/
So the first game is worth a purchase? I heard some aspects of the gameplay, particularly the save system, were kind of annoying.
I would get it. Just realize that it plays a bit more like an old-school game in that you will be repeating the beginning a few times and getting a bit farther each time. The game itself can be beaten in 6 hours from start to finish (not counting the extra mode), so the added time is in replaying. Also realize that you are on a time limit, so be careful of saving if you are not sure if you can get to your next story adjective in time (or next side-objective if you are trying to do all the objectives before time runs out). It also worth redoing the first day a few times just to level up your character as your levels and skills carry over between games.