BOOM video 7123
In the map Aqueduct, Ezio must venture into the mines in Tivoli where Templars are in search of treasure. Naturally, Ezio enters to stir up some trouble. The other included map takes place in the Trajan Market and features an on-foot chase sequence--one of my personal favorite activities from Assassin's Creed 2.
Assassin's Creed Brotherhood launches on November 16 for the Xbox 360 and PS3. A PC version is expected sometime in 2011.