If you missed all the commotion yesterday, 3D Realms has purposefully let slip a pair of Duke Nukem Forever screenshots. The images appeared in the newly released Xbox Live Arcade version of Duke Nukem 3D, and 3D Realms later posted high-resolution versions here. Beware if you're at work, though: the second one shows a pair of digitized strippers in scanty outfits.
The first shot (pictured above) contains some cleaner, PG action, since it shows combat with what looks like a couple of glossy, bump-mapped "octobrains" with glowing eyes. That's classic Duke right there, although the model design and texturing seem a tad rough around the edges for a 2008-2009 game. Still, 3D Realms has included generous amounts of color bleeding and fancy shader effects.
If you're longing for more DNF action, 3D Realms released a teaser video last year, and the Jace Hall show posted a high-definition gameplay clip back in June. You can always look back to clips from previous iterations of the game, too.