I'm not saying that the same desktop OS will run on both devices, but rather that the overall UI and functionality can be shared. Though, in a couple of years,

I'm not saying that the same desktop OS will run on both devices, but rather that the overall UI and functionality can be shared. Though, in a couple of years, who's to say that Ubuntu won't be able to run on most devices? Maybe there are challanges, but I doubt that it would be impossible. It's just a matter of time and maturity. I think people are already asking for one user environment across devices, so I bet it's something they might have in mind.