TechCrunch is also reporting this, which makes it immediately suspicious, but there is a fair bit of corroborating evidence to suggest that 3D Realms and possibly even its parent Apogee are no more. 3D Realms, of course, was most famous for Duke Nukem 3D and the vapourware Duke Nukem Forever, while Apogee did numerous shareware games including Wacky Wheels, Halloween Harry and their biggest hit, Wolfenstein 3D.
http://www.shacknews.com/onearticle.x/58519
Take-Two does still have publishing rights to DN4E, so maybe it'll still emerge from a different publisher.