Ripped from the headlines in the ME messageboards...
According to www.gamerlive.tv/article/ces-2012-best-ces-gaming
"Mass Effect 3 -- Somewhere off the show floor (we mean wayyyyyy off -- the Four Seasons Hotel), Electronic Arts held private showings for Mass Effect 3, to showcase the game's upcoming Kinect features and reveal a demo date. While we can't tell you anything until tomorrow, we can say that fans are definitely in for a treat. Be sure to watch this space for the full reveal Wednesday morning."
Mega Update: http://www.youtube.com/watch?v=jGs7y381WPY (taken down)
End of the video has the release date!
The demo will be out on Xbox live February 14th!