They might also support cutting edge stuff like usb and flash. None of that is as important as a good ui, but that's pretty much a solved problem at this day and age.
By tablets, just to clarify, we are talking about always on fanless noiseless slates that can also be carried to use on the couch to read newspapers etc and are incredibly light such that they are almost weightless in your bag. We are not talking about slate PC's. Which are just glorified laptops complete with all their deficencies.