The German branch of Ubisoft has released a video that shows off some of the new features that will appear in the upcoming PC-version of Assassin's Creed: Brotherhood. There will of course be graphical updates compared to the console versions, but the PC game will support stereoscopic 3D - both Nvidia 3D Vision and AMD's Eyefinity will be supported. The latter will also allow you to use more than one screen in the game, if you want to sneak around Rome in extra-extra-widescreen.
The video can be found on Ubisoft Germany's site, but it is in German. You have been warned.