I like the concept of the new UI and evolving the iPod Touch and iPhone OS into a full blown one that can be used on a tablet. That could be Apple's answer to that thing some PCs do, where you don't have to boot the OS to run certain media apps. That saves power and runs a small OS in RAM instead of off the HDD.
It would also make it easier for Apple to give us a smartphone in the near future.
One thing about the mockup... it's great... let's just loose the cheezy iPod Touch body, and come up with a new one.
