There's been no announcement of it coming out on Linux, except for a strange announcement within Steam itself many months ago, that was quickly taken down again and was therefore probably someone at Steam making a mistake.
I'm not sure about Wine, so maybe someone will clarify on it later, but if you paid AUD100, it doesn't seem like much of a bargain. Personally, I'd recommend going for the refund and picking it up again later. I think (but don't know) that it will happen eventually, as it did with TW2.