The Killer Features
To preface, I am a college student who owns both an iPhone and a MacBook Pro. The iPhone is good for walking around with, listening to music, quickly checking (sending is kind of pain for anything but quick replies) emails, and, well, being a phone. The MacBook is used for power and travel. I move around a lot and it's nice to take power with you. I need things like photoshop and Xcode on a day-to-day basis. But, the MacBook is annoying to take into normal classes as the 15" model demands most of my desk space and can get tedious to keep up on notes with. iPhones are generally frowned upon in class and the keyboard is to small to take a lot of notes on anyway.
The gap that Apple could really bridge here, for both students and businessmen, is a device that could download books, manuals, references, ect. and have decent enough tracking to actually write, not type, notes and applications on. If I could remove 30 lb of notes and text books from my book bag and replace them with a single device, that would be gorgeous. I would absolutely have no problem paying up to $1,000 for such a device, especially when physical textbooks already run well over $300 a semester. Oh, and no more lost/damaged papers!
Obviously this is all speculation based on MacRumors postings and wishful thinking; but, hopefully Apple will agree with me, at least on this function.