Ubisoft's most recent triple-A titles will thankfully be unaffected: Anno 2070, Assassin's Creed: Revelations, Driver: San Francisco, and Just Dance 3 will all remain playable (both online and offline) during the transition. The OSX version of the original Assassin's Creed, however, will be completely unplayable, as will the OSX version of Splinter Cell: Conviction and the PC versions of Might and Magic: Heroes VI and Tom Clancy's HAWX 2.
The online portions of all other Ubisoft games will be disabled during the transition, although offline modes should still function normally. Ubisoft has yet to provide an estimated completion date for the move, recommending instead that people follow its official Twitter account for updates.
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Sony PlayStation 3 (late 2012)
Microsoft Xbox One