Kumquatq3 posted a bunch of Van Buren screenshots in this thread over at No Mutants Allowed. Check 'em out.
Also of interest to modders is this screenshot, posted by Briosafreak, of the Van Buren World Editor. It showcases the location Mesa Verde.
The more I see in game screen shots of Van Buren,
the more I think the graphics really aren't that great.
Especially the character models. Granted, I guess the graphics
weren't exactly finished, but it still doesn't look all that
good. Let's hope Bethesda can at least one up them.
Edit: You can also check out the images in NMA's Van Buren Gallery.