The ever-astute Redwood sends word that he's confirmed with 3DRealms' George Broussard, that Duke Nukem Forever will, in fact, be integrating Epic's Unreal Tournament code base. This is the first confirmation of this, as they had earlier stated that they had stopped integrating new code from Epic. Stomped also posted this quote, regarding the full status of the game:

Once we move the code to Unreal tournament's code base (November/early Dec), we'll be ready to rock and finish the game up.