I'm with Tynstar on this one. There's no WAY I'm shelling out that kind of cash just to play 1 game! And I couldn't care less about Blu-Ray.
Assassin's Creed was only 1 of 3 PS3 titles that held any interest to me (the others being Heavenly Sword and Resistance:Fall of Man).
I was surprised that at E3 Ubisoft was only showing it on the PS3, given the fact that most of their current gen products cross-platform. Bring AC to the 360!
I think it's especially funny that they believe the video footage at E3 was off the 360 dev kit!