Capcom announced that the world in Dead Rising 3 will be larger than the worlds in both Dead Rising 1 and 2 combined. They also announced that Dead Rising 3 won't have any load screens between areas either. I'm looking forward playing some multiplayer once this comes out, and I totally appreciate large worlds that don't constrict you like Arkham City, Elder Scrolls, etc.
Via Gamespot
"We wanted to go truly open-world this time around. No more load screens," executive producer Josh Bridge said. "With the biggest world that we've been able to make, with loads of zombies."
Via Gamespot