UPDATE: VG247 has been in contact with Rockstar regarding the OFLC modification for Vice City, and it appears that Rockstar had the game re-rated as part of "ongoing work with history products". What this means for Vice City, and the three other games listed above, is still unclear. We'll let you know of any updates.

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According to the ESRB's website, Grand Theft Auto III, GTA Vice City, GTA San Andreas and Max Payne will all soon be making the jump over to the Mac OSX platform. While Rockstar has not announced nor shown any signs of taking this step, it all makes sense considering the recent push to support both Windows PC and Macintosh, most specifically by Valve who have made both their Steam service and their games available on the Mac OSX. Since this hasn't officially been announced by Rockstar, we don't know more than these subtle hints, so whether the ports will be native or emulated is anyone's guess at the moment (though it does seem unlikely Rockstar would port an engine it no longer uses). It is possible that, if the games are available through Steam, they may be listed under Steam Play, meaning those who currently own the PC versions will be able to play on both the PC and Mac without requiring any re-purchase.

Additionally, Australia's OFLC ratings board has mysteriously modified their rating of GTA Vice City, updating it to newer guide terms ("Strong Violence", compared to "Medium level animated violence"). At the moment it is unknown why this change has been made, and whether it was on request from Rockstar, or something the OFLC has taken upon themselves.

Source: ESRB and OFLC