Here's a teaser trailer for the fourth title in Ubisoft's Assassin's Creed series, Assassin's Creed Revelations which is due this November on 360, PS3 and PC. This trailer is also available in HD.

Assassin’s Creed Revelations follows master assassin Ezio Auditore as he walks in the footsteps of hislegendary mentor, Altaïr, on a journey to recover five ancient seals that hold the keys to the future of the Assassins brotherhood. It is a perilous path – one that will take Ezio to Constantinople, the heart of the Ottoman Empire, where a growing army of Templars threatens to destabilize the region.