Not sure whether this is a prank or not but according to a post on Shacknews from 3D Realms' co-owner George Broussard, the tiny thumbnail you see on the right is an in-game screenshot from Duke Nukem Forever.
If this is true, it's the first new screenshot of Duke Nukem Fornever in years. This piece of vaporware has been "under development" for almost ten years now.
Common 3D Realms, you got to do a lot better than this. Release some new big screenshots to show off DNF to the world.