The "Balls of Steel" Edition (yep), revealed to DNF "First Access Club" members, is overloaded with stuff, including a hardcover artbook, postcards, a logo sticker, a comic book, poker chips, dice, playing cards, a foldable papercraft, and -- oh yeah -- a bust of Duke Nukem. There's even a numbered certificate of authenticity, to prove to others that it's the genuine article. Notable omissions include steel stress balls and, in fact, anything spherical or metal.
The Balls of Steel Edition will be available in limited quantities for Xbox 360, PS3 and PC at launch (the week of May 3).
Update: 2K has provided additional details in its press release (in full after the break), revealing that the Balls of Steel Edition will be exclusive to Amazon and GameStop in North America -- for $100.
[Thanks to everyone who sent this in!]