The ESRB, showing a good amount of common sense, ruled that its M rating for Manhunt 2 will stand, even though some modded Playstation Portables are capable of accessing certain content deemed Adult-Only. Patricia Vance delineated this ruling from the ESRB's opinion of the Hot Coffee mod from GTA: San Andreas, pointing to the increased inaccessibility from needing a modded PSP versus PC software and the fact that the content was disclosed to the ESRB when the M rating was given.
ESRB Allows Manhunt 2 Rating to Stand
I think the ESRB is doing the right thing here. It takes a lot of effort to unlock this content, and if Take Two was upfront about it being there, no point in punishing them with further delays and increased headache.
Despite this "endorsement" (?), Target has still decided not to sell the game on its shelves, though they will sell it online.
M for Missing Target