According to Xbox360Achievements, the WWE All Stars demo will be available on March 22nd.
Quote:
"THQ has today dated the demo for WWE All Stars, which will enable you to pit the might of Ultimate Warrior on the Legends side against the speed and acrobatics of WWE Superstar Rey Mysterio. Each grappler belongs to a different class from the four available in the full game, giving you the chance to try out the Brawler and Acrobat classes respectively.
The WWE All Stars demo will be available to download with 2-player local multiplayer, from March 22nd, while the full version of WWE All Stars will be suplexing stores on March 29th in North America and April 1st in Europe."
Stupid question but will there be 1 player offline available? THQ need to step up their game; EA is offering limited online with most of their demos these days and they should follow suit. Online is where it shines with games like these.