Well, Michael Hoover did say in a quick Computer Music Magazine interview that although he thought that there would be no MAC version of SONAR, that it was much more likely that there would be something new created for that platform.
I agree -- it's tough to compete with LOGIC at it's price point (which is actually $199), but I really don't think there's much other choice -- it seems to me that even though there are large number of Windows users, the 'consumer momentum' does seem to be with the MAC, especially when it comes to DAW's. It seems that SONAR is now the lone holdout as the only major DAW that is not cross-platform now. Yeah, I know -- LOGIC isn't either, but hey, it's Apple, and they are trying to sell their boxes.