The other day I was thinking about why they didn't start by porting their flagship app (Photoshop) first. After discussing it with a friend, he made a good point:
Photoshop has no real competition (yeah, yeah, I know there's like seven Corel users and some other obscure bitmap editor fans, but believe me, Photoshop has no equivalent). Anyway, Freehand is a serious threat to AI, so it only makes sense to port the most threatened apps first. Take GoLive for example, also threatened by Dreamweaver, next on the list. And gee, how about InDesign? Yup, I smell a Quark fight.
Photoshop, as awesome as it would be in X has no serious threats and can wait for round two.