Ubisoft hasn't formally announced Far Cry 3: Blood Dragon, but thanks to the platform classification ratings and XBLA artwork leaks, it's well known that it exists. To add to further speculation on this game, the Achievements popped up this morning on Exophase.
The Achievements total to 400G, which is the base GamerScore allowance for an XBLA game. As such, this list further propogates the rumors that Blood Dragon will be a standalone game. If so, that could be interesting, as the standalone game for inFamous 2, Festival of Blood, did fairly well.
Obviously, we have no release date or price point since the game hasn't been officially announced yet. Did you enjoy Far Cry 3 enough for a separate game?