I'm surprised it's not already out, but I think it's pretty obvious by now what the specs/features will be--(completely new) 16mp sensor, live view, sensor cleaning, etc.
The one thing I hope to God they "take" from Nikon is the in-camera level. Although they basically work, I hate using those flash shoe bubble levels. It's an incredible pain, especially with a ballhead, to take your eye away from the viewfinder and try to level the camera while still maintaining your composition. Please Canon, please!