UbiSoft has an official press release with the release date of Assassin's Creed. AC is scheduled to be released this November for three platforms: PC, PS3, and Xbox 360. Each platform should have the same retail price of $59.95.

The Assassin's Creed Official Site has a lot more details. It's being developed by UbiSoft's Montreal studio.

"The game is set in 1191 AD, when the Third Crusade was tearing the Holy Land apart. Shrouded in secrecy and feared for their ruthlessness, the Assassins intend to stop the hostilities by suppressing both sides of the conflict. Players will assume the role of the main character, Altair, and will have the power to throw their immediate environment into chaos and truly experience the art of a master assassin."