Word has come down from Blizzard that Diablo III for Mac will only support English, French and German. Sorry all you mac users out there but come on did you really think that you wouldn’t be punished in some way? The source come from the list of languages that the game will support it clearly reads:
For Windows users, Diablo III will be fully localised into English, Latin American Spanish, Brazilian Portuguese, French, German, European Spanish, Italian, Polish, Russian, Korean, and Traditional Chinese.
Mac users will be able to play Diablo III in English, French and German.
Heck maybe this is a good excuse to take up a couple new languages I would go with French if I really had to make the choice.