"Here is a brief description of multiplayer mayhem and single player story information (Read Spoilers) for the upcoming Gears of War 2. Viewer discretion is strictly advised at all costs.
There is no more sticking to walls, players can wall bounce but again it's not as fast enough. They can also break out of their slide before going into cover, the party system very similar to Halo games made by Bungie."
The first three paragraphs are related to multiplayer so they do not contain spoilers, the last bit contains info on the story, read these at your own risk.