I really don't understand why everyone is clamoring for a "full" version of Photoshop for the iPad. Photoshop for the iPad should be FOR the iPad. I use PS on a desktop workstation in my workflow everyday. I don't know what everyone else's PS workflow is, but if I had to do mine on an iPad, I'd consider blowing my brains out.
Sorry, but despite what Apple's marketing department and a few deluded starry-eyed folks may be trying to convince us of, the iPad is much better suited for consumption, much less for creation. The opposite is mostly true of desktops, and laptops are the compromise. I don't see anything changing that in the near future, at all, no matter what Apple or progressive fan-boys may try to tell us.