From looking at the screenshots, here is what we *think* the plot of Dead Rising 2 is: Reality show Terror Is Reality has mortals slay zombies for cash and prizes. A virus has infected folks, turning them into zombies.
After being rounded up and quarantined, these zombies are turned into fodder for this reality show. Things go horribly, and the zombie hoard penetrates the arena and spreads throughout casino town Fortune City. And it's up to motorbike enthusiast Chuck Greene from the reality show to save the day with a TV camera, a slew of weapons and duct tape.
Capcom's released a fresh batch of Dead Rising 2 screens. These are them. The game is being developed by Blue Castle Games for the PS3, Xbox 360 and the PC.