You're right Editguy43: Vegas Pro 12 Premium and it looks like you have to get it through a dealer.
Regarding a mac version, on february 7th, Sony posted this on their facebook page:
Hey, everybody that's asking for Vegas on the Mac - a couple of questions. 1) you're using Vegas on a PC right now, right? and 2) what would you want from Mac Vegas that you can't get from PC Vegas?