Not a tablet PC. PC's just don't work at this scale, and anyway you have your laptop so why carry something else?
I think this will be a Book reader internet browser based on the ipod touch and itunes for literature downloads, Magazines newspapers and Novels tied in to itunes
Like the original article for this thread says, it's supposed to have an OS that is between the iPT/iPhone OSX and the desktop OS X; a "third" version of OS X. I think that does include possibility of "a tablet PC", if it's able to run desktop OS X applications.
I'm sure that it will include ebook functionality, especially since there's already an Amazon ebook app on the iPhone/iPT. So, it might be handled via Amazon, or it might be handled via iTunes. But I doubt that will be the only thing (along with screen size) that distinguishes it from an iPhone/iPT.
I expect that the deciding factor will be whether it's an ARM or an Atom CPU. The Cocoa libraries already have (or had, back in the later NeXT era) the ability to use 1 code base on multiple GUI's ... the OO polymorphism extended into a Windows menu system vs a NeXT menu system, and so on. You could create optimized versions of your GUI for each platform, but you could also forgo that (if you were willing to put up with minor artifacts).
I would be surprised if an Atom based Apple tablet, even if it had a 3rd GUI that's in between the desktop and iPhone GUI's, was incapable of similarly "doing the right thing" in displaying a desktop OS X app on such a tablet in a manner that conforms to the tablet's GUI. It may also be able to emulate the much slower ARM CPU at a fast enough speed that it can run iPhone/iPT apps, as well.
But if it's an ARM based tablet, I don't think you could emulate the x86 CPU fast enough for it to run desktop OS X apps. That would seem to indicate that it will just be a larger iPhone/iPT that is mainly just adding e-reader capabilities to the product line.
Obviously, I'm hoping for the former (more than just an e-reader in the iPhone family, an "Apple Tablet PC") ... but I can sort of see the logic behind Apple only doing the latter (just an Apple ebook). I'd definitely buy the "Apple Tablet PC" type. But, would I be likely to buy the "just an Apple ebook"?
It depends ... my needs don't require that I can run actual OS X desktop apps, but they do require that I can do things I can't currently do on the iPT/iPhone. Will it have at least one USB port, for attaching a real keyboard and maybe a mouse? And/or a bluetooth HID profile for bluetooth keyboards and mice? Will it have some form of video-out (pref. a micro version of the Apple display port)? Or, in lieu of those, can it act as some form of remote desktop server (actual Apple Remote Desktop, or as a VNC server)? An SSH app (that can run both with a virtual keyboard, and without it, and in both cases displaying an 80x24 terminal)? A true desktop quality web browser (not limiting you to just the iPhone version of web pages, supporting flash, etc.)? Will it be able to run real IM applications, and similar apps with persistent background processes? And what type of WWAN capability will it have (integrated into the "motherboard"? USB dongle? Express Card? PCI-Express-Mini card? Bluetooth tethering? none of the above, just Wifi?)? The answers to those questions would determine whether or not I'd buy the device.
(actually, those questions would apply to both versions of the device, I'm just rather sure that if it's able to run desktop OS X apps, it will be able to deliver enough of those questions that I'd be willing to buy it)