Here [1] is the second part of the presentation, featuring the complete video (which you can find here [2]). I actually think the way they presented the device during the keynote was brilliant: present it first as a "regular" laptop, then revisit the presentation immediately and reveal the device as what it actually is (a tablet pc with a base). Even if you could rather easily see it coming, I think a lot of minds were blown at that moment.

[1] https://www.youtube.com/watch?v=2UAvdxEjns0

[2] https://www.youtube.com/watch?v=XVfOe5mFbAE (1.6M views in about 22 hours)