Renaissance astronomer Nicolaus Copernicus is the focus of the new content, and he gives extra assignments. It's a free download for November 16th.
"The missions are part of a storyline involving a conspiracy against Copernicus and his heliocentric philosophy, which was revolutionary at the time," said Sony. The Copernicus Conspiracy releases for free alongside the game's launch.
We get extra courier, assassination and protection missions in the bundle. It's possible these might make their way to PC at least as Assassin's Creed 2 came with all the DLC that was released when it finally came to desktops.
Assassin's Creed: Brotherhood releases on Xbox 360 and PS3 November 16th in the US, and on November 19th in Europe. A PC version isn't due until March 2011.