Board Thread:General Discussion/@comment-8456133-20141003001501/@comment-3157150-20141003001907

"In full transparency, both of these versions are very much in development, so we cannot make any promises as to a launch date — or even if they will ultimately be feasible — but we wanted to make sure that our long-suffering Mac/Linux fans know that we are working diligently to bring Terraria to their platform," the post reads.

They're on the way, and apparently quite far along.