Some alleged Duke Nukem Forever footage was available for a while on Liquidmesh 3D, the website of 3D artist/animator Bryan Brewer, but the page and the video linked on YouTube soon disappeared. Make your own analogy about closing the barn door after the horse has escaped, though, because the footage is now available on places like GameTrailers and Primotech, offering a look at concept animations, in game footage, and even some virtual boobs from the erstwhile shooter sequel. Also, there's an article on Duke4.net with a collection of tidbits in an attempt to create a timeline for the closure of 3DRealms (thanks Voodoo Extreme), though this is collected from various unverified internet postings, so it all should probably be placed under the heading of rumor and hearsay for the time being.