According to RockstarNexus on Max Payne 3 OSX.
The tech has been used in the past to bring other Rockstar titles to OSX such as the Grand Theft Auto III trilogy. While the port has not yet been officially announced, the evidence is pretty solid. The Steam database has been the source for a number of title leaks in the past and the entries are created by the developers themselves. No word yet on when to expect a release so stay tuned.
Source: Steam CDR