We would suppose the Ultrabook intends to open up a new niche, delivering the portable benefits of a tablet device with enough processing muscle to get the work done, somewhat akin to merging the strengths of both the MacBook Air and the iPad in a single device.
It must be said, however, that Intel’s Ultrabooks are based on Intel’s current Sandy Bridge architecture, with the Asus UX21 spearheading the effort at the moment. Perhaps future models will be more groundbreaking, but in the mean time, you will just have to make do with specifications such as an USB 3.0 port, a mini-HDMI port, and SSD storage.