The demo shown in video is realized with msn.com website, the only new things I saw in this demo is that Microsoft is showing its own bugs in a demo video (That's how IE mobile currently render webpages). Otherwise opening a website of 300kb even if you render it correctly and open it fast, that is 300kb !! And that's too much for mobile browsing, I don't know how the current solution can handle such size in memory, I'm waiting my copy to test it, but my old Imate become very slow before opening any page. I finished by give it to mom, because I'm sure she will never surf the web with it. Anyway this is just a preview with very basic feature and tons of limitation :

As a technology preview, Deepfish is early in its development cycle (still a few releases from beta quality). As a result some features are not implemented or are only partially implemented. Currently, the technology preview does not support ActiveX controls, AJAX, cookies, Javascript, and HTTP POST.

Seriously DeepFish : Go fish !