Straight from Adobe's John Knack
From MacWorld's forums:
http://www.macworld.com/article/132810/2008/04/photoshop64.html
Re: Photoshop CS4 to be 64-bit for Windows, but not Mac
leicaman wrote:
Understandable. But I hope Adobe doesn't wait until CS5 to release the 64 bit version for OSX if they finish it.
We'd like to provide more guidance about when we could ship a 64-bit-native version of Photoshop for OS X, but given the fact that no one has ever attempted a Carbon->Cocoa port of this size, we don't want to be irresponsible and provide specifics that we don't yet have. I mention in my blog post that we're targeting CS5, but it's simply too soon to make any hard and fast statements.
I can offer a little bit of history, though. When Apple moved from 68k processors to the PowerPC, Adobe offered a free update to PS 2.5. (Quark, as I recall, charged handsomely for the equivalent update.) Later, when the G5 came out, we offered a free update to Photoshop 7, even though CS1 was just six weeks off. (It would have been easy to say, "Well, to get that update, you have to buy the new version," but that's not how we wanted to roll.) Then when the PPC->Intel transition happened, the scope of the changes were too great to offer that kind of update, but I was able to persuade the company to do something it had never tried: releasing a public beta of Photoshop so that all current customers could get native performance six months earlier than would otherwise have been possible. It was quite a gamble, but it was the right thing to do.
I'm not saying that not being able to deliver a 64-bit-native CS4 for Mac isn't a drag; clearly it is, and if we had a way to change things, we would. All I can do is point to the Photoshop team's track record over the last ~15 years of Apple platform transitions. We'll keep working closely with Apple & thinking creatively about how best to deliver what Mac customers want.
Two other things, in case you don't want to wade through my whole blog post:
-- Let me reiterate that we respect Apple's decisions with regard to OS strategy. Just like the rest of us, they have finite resources and have to make tough calls. I don't want people to get the impression that Adobe is whining and pointing fingers. We're simply trying to give customers some insight into where things stand.
-- There are lots of ways to skin the performance cat, and 64-bit is just one among them. It isn't a magic bullet. I can't get into specifics now, but you'll see us doing more than ever to take advantage of Mac platform technology in CS4 and beyond.
Hope that helps,
J.