The tablet version of the Ultrabooks look better, 12.5 screen, faster processor, more connections, better keyboard, better screen resolution. Only drawback on the Ultrabooks is 5 hour battery life but some, like Sony, offer an additional wafer battery add on that jumps it to 10 hours. Sony is $1,200 loaded with 6GB memory, 128GB solid state drive, extra battery.
It looks like Surface Pro is going to be in the same $1K price range but smaller, less resolution, less battery time.
Shame about the lame Windows RT8 graphics. You'd think they'd try and compete with IOS and Android on the tablet interface.