I expect it will be amazing.
Just like the FFXII demo. SE said the demo will be longer than the movie it is packaged with. AC:C is supposed to be like 2 hours long, right?
So we get to play the first 4% of the game... (supposing the game is 50 hours long)
Coooool.
PS. I still think the whole "snow" thing is a rumor.