When did you get this information ? What I said was published by Pixo here at the forum, it said Z4 in Q4 with Mac 3.5 by the end of September. Unavailability of the later says no Z4 this year to me.
I know you said sorry already, but to your question, I am happy. Not having ZBrush on par with PC version is bearable by me. If I need it that bad (I don’t and if Pixo keeps frustrate me, I might never buy it), I can get VMWare or Bootcamp and install it there. Only have to deal with the pain of Windows for one application, but you are stuck with it full time. On the other hand, what are your options for Mac-only software ?