Regardless of this, Ubisoft will likely have cause to celebrate as Assassin's Creed 2 is being released to high expectations, with early predictions of high volume sales. As a side note, those initial sales will be sourced exclusively from Xbox 360 and PS3 releases of the game, as the PC version isn't due for release until next year.
The same scenario surrounded the original game, with consoles getting a release several months before the PC. Eventually Ubisoft made it up to PC gamers by giving them PC exclusive content. That may not happen this time around, but PC gamers can always hope.