According to UBISOFT
Ubisoft offered gamers a curious update on the Assassin's Creed franchise in January, saying that the next "episode" in the series would introduce "an online multiplayer mode." Though scant few other details on the project have been made available, Ubisoft has said that it will be a stand-alone product featuring Assassin's Creed II protagonist Ezio. A URL registration from April also indicated that the game would be titled Assassin's Creed: Brotherhood.
Game is to be announced this year
More Info >> http://kotaku.com/5531849/gamestop-placeholder-art-names-assassins-creed-brotherhood-+-update
Game will be available for PC, X360 And PS3
http://www.gamespot.com/ps3/action/assassinscreedbrotherhood/index.html?tag=related-game;title