NMA has put up a bunch of previously unreleased Van Buren screenshots. Check them out.
To be honest, I'm not that impressed. Aside from the kinda crumby graphics, which I guess can be attributed to this being just a tech demo, it appears they did away with the Pipboy dialogue interface. And I really don't like the damage indicators on screen. It's waaaay too console.
Also, supposedly Kharn is going to put something else exciting up tonight. Maybe the tech demo? Wait and see I suppose.