Ubisoft - or rather, its UbiWorkshop multimedia hothouse - has revealed a couple of "secret projects" it's working on, teasing one with Egyptian-themed Assassin's Creed art. It is not a game, however, and not related to Assassin's Creed Brotherhood.
The image shows what looks like an Egyptian assassin against a backdrop of the great pyramids. According to the UbiWorkshop, it has "nothing to do with Assassin's Creed Brotherhood". Ubisoft has also told VG247 that it is "a non-game-related project".
Assassin's Creed: Brotherhood is an extension of the Assassin's Creed II story that also brings multiplayer to the series for the first time. It's due out at the end of this year. Expect more details from E3 in just over a week's time.