Rockstar Games has revealed that the classic GTA trilogy (Grand Theft Auto III, Grand Theft Auto: Vice City and Grand Theft Auto: San Andreas) will be released on Mac "most likely later this year." Rockstar has promised more information and a proper announcement soon.
In other news, Rockstar has said they'll be releasing info on the long-awaited L.A. Noire very soon. "The game is truly groundbreaking and we will have more information very soon. We may even try to steal a screenshot and sneak it out here [on the R* News Wire] or on Twitter..."
Link: Rockstar News Wire - Asked & Answered.