What I've always thought would be very Mac-like if Apple made a tablet would be something along these lines:
1. You have a tablet running something similar, if not identical to the current iPhone/TouchOS.
When you're walking around, on the couch, in the bathroom, using the tablet, and Touch Versions of Pages, Numbers, iPhoto, Keynote, etc your data is stored on the tablet in a shared space.
But, there may be times when you *need* more.. ommph.. or a full sized KB or mouse for more intensive data entry.
at this point we move to step 2..
2. Dock the tablet to your Mac and the data is THERE. No syncing w/ iTunes, no copying, you see the tablet data immediately and can chose to open the Desktop apps to edit/modify the files as you need. A new Finder Window showing this data would open automatically.
The iMac-like Mac with a dock inside it would be idea, but in theory, any Mac with a Light Peak connector would do... (yes I went there)
3. Tablet owners with USB/Firewire only Macs would dock the Tablet as they currently dock their iPods/iPhones, and would have to sync before accessing tablet data...
I see this as the direction Apple is most likely to take a tablet.. I think any release of a tablet is tied very strongly to new methods of moving large amounts of data to and from your Mac and the tablet. (Light Peak) Any demo of a tablet will include a demo of of this tech as well.