Has anyone considered the possibility that Leopard's delays may have something to do with the potential emergence of a multitouch Mac?
After seeing the Jeff Han demonstration at TED, and the iPhone, and noticing the feature sets in Leopard being more and more inclined toward a three-dimensional UI environment, I spoke with a former Apple engineer who interacted with vendors, developers, customers, etc. as part of their product development.
It's a foregone conclusion in his and my mind that Apple is testing working prototypes of a 3-D user interface on a multi-touch tablet Mac. It's just a question of when they'll be ready. Their product development cycles are, according to him, about two years.
I think iPhone is a tactical product in a larger business strategy seeking to leap way ahead of Microsoft and completely redefine, again, the way people use computers. And while I'm very skeptical of the possibility, I do find some suggestions in Leopard's known features (like time machine, cover flow, spaces, etc.) that they may be closer to launching a multitouch Mac than anyone could anticipate.
They certainly surprised the world with the Intel-ready dual binaries of OS X which analysts thought would take another two to three years just to develop and test AFTER Apple announced plans to move to Intel processors.