Update: It has been found. Someone posted the screenshot.

Amazing. Now we are getting reports that HALO 2 (PC) has been recalled do to partial nudity.

“It has come to our attention that an unfortunate, obscure content error which includes partial nudity was included in our initial production of “Halo 2” for Windows Vista. As such, we have updated the initial game packaging at retailers with a label, so customers are aware before purchasing the game. Additionally, we’ve developed an online update which can be downloaded from www.halo2.com to remove the content.” (via Next-Gen)

HALO 2 (PC) is getting off to a rocky start. My halo2pc.org forum is full of people complaining. Those that have the game are complaining about technical problems with the game and Games for Windows - Live. Those without the game are complaining that the game is delayed. Now this. I guess it will result in more sales, though. I mean...it's going to get a ton of free publicity.

BTW: I found an old Easter Egg the other day when playing through the campaign. Do Easter Egg's like these HURT the game by causing the ESRB to think: "Hmm. They put this obscure graphic in the game. I wonder what else they can do. Better look really close. Decompile that source code!"

(click image for hi-res version)