Now that Gibson owns (or is in the process of owning) Sonar, maybe there will be a new direction and a decision to develop a version for Apple PC's. However, with a small part of the PC market it may not be worth the cost to develop and support Apple OS's.
Like Sacalait, I too have an iPad and an IPhone5 (and I'm happy with them), but I wouldn't consider paying 3 or 4 times more for an Apple PC.