Ubisoft is doing there usual ‘ramp up’ before the release of their new game at the end of October by adding titles for different platforms.
Assassins Creed: Liberation HD, which was originally exclusive to PS Vita, will now arrive on PC, PSN and XBLA. Liberation HD will have a complete overhaul in terms of HD graphics and gameplay to match the systems they will be released on, which suggests that Liberation HD will play as a fully functional expansion to AC3.
Also, Ubisoft is releasing Assassins Creed: Pirates for smartphone and tablet. Pirates will be similar to the makings of Black Flag. Ubisoft Paris is working on a new game engine to bring 3D-like graphics to the smartphone / tablet version with immersive gameplay to match Black Flag as much as possible.
Assassins Creed: Liberation HD Trailer
Assassins Creed: Pirates Trailer
Assassins Creed: Pirates will be available this fall, as for Liberation HD it was not announced when it will be available.