3 Weeks Ago, NintendoDS Advanced says (in No demo for Assassins Creed II) As a lot of you may know the original Assassin's Creed didn't have a public demo before its release either. Surely not having a demo for a game can hurt sales depending on the games hype at the time. I do think Assassin's Creed could of possibly done better if it had a demo before hand. A Ubisoft rep...

And Owen Good from Kotaku says (in No Demo for Assassin's Creed II, Either [No Plans Watch]) Connected Consoles reports that, at the Eurogamer Expo, an Ubisoft rep told them straight up the game will not be getting a demo. Your only opportunity to try before you buy is if Ubi brings it to a public expo near you.
No Demo for Assassin's Creed II [Connected Consoles via Game Stooge]