Let me apologise right away for the shortness of this item - I've been working on a very long and detailed article about Palm (we're looking at close to 20000 words here - it's very long, the longest ever on OSNews I'd guess), which has obviously been sucking up quite a lot of my time recently (hence the slower updates on OSNews). Luckily for me, though, Canonical's video is pretty self-explanatory.
Out of all the features demonstrated, the device integration at the end of the video has me the most excited. I've long held the belief that the idea of having a smartphone, a tablet, a laptop, and a desktop is overkill, and that it would eventually go the way of the dodo. While the separate devices will continue to exist - e.g. lots of people specifically require a powerful desktop - I'm convinced the future will have us own a single device (say, a smartphone), which will wirelessly 'dock' with whatever display and/or input method happens to be around.
It seems like Ubuntu is pretty far along the road to this future, and if they can pull it off, they might just outdo everyone else out there. I'm incredibly intrigued by all this, and I will surely wipe my Nexus 7 once the Ubuntu images become available.