The mac version of this game will be considered a mod. It will be called Italienischenfront: '15-'18. There is another mod planned to be in the African front (Palastine, Suez Canal, etc.) but we're not too sure about that just yet.
The exclusive Mac version of the game is this mod. And there will be 2 PC exclusives, Eastern and Western front, and a PC/MAC version which we think will be the African front.