Rumors are tonight Cliffy B will show actual footage so not a teaser
http://www.gamerzines.com/xbox-360/news/gears-of-war-3-tonight.html
It's very possible considering the game would have been in development for over a year and half now. I kind of curious to see what Epic has achieved with Gears 3 considering its supposed to have the new shadowing, lighting, foliage and animation systems that they have added to the engine since the release of Gears 2.
Neat trailer, but the Mad World one is still better.
Trailer here... http://www.latenightwithjimmyfallon.com/
Tommy McClain
Epic's Rod Ferguson offers up some details, including 4 player co-op.
http://forums.epicgames.com/showthread.php?t=723963