I got this info from MouseInfo site. There's a cool pic of one of the monsters on the ride on the site too.
"In the hit 2001 computer-animated film, the residents of Monstropolis generate their city's power by scaring children, and in turn, are terribly afraid themselves of being contaminated by kids. So when an errant little girl nicknamed Boo accidentally enters Monstropolis, the city finds its world turned upside down.
In the attraction guests hit the streets of Monstropolis to follow the films stars Mike and Sulley on their mission of safely returning Boo to her bedroom. Adding to the excitement, guests must elude the frenzy of trucks, helicopters and yellow-suited personnel of the Child Detection Agency.
Guests will laugh and scream as they dash through Mike and Sulleys world, getting a Monsters-eye view of this detailed and dimensional city, says Kevin Rafferty, show producer for Walt Disney Imagineering, creative arm for all Disney parks and resorts. Were bringing Monstropolis off the screen and fully to life with hammers and nails, in the classic Disney style of storytelling.