Gamasutra intercepted an official ESRB email sent to all major publishers that reiterated a toughened stance on hidden content in video games.

The email states:

Fully disclosing hidden content accessible as Easter eggs and via cheat codes has always been part of ESRB's explicitly stated requirements when submitting games to be rated. In the July 20 public announcement, which focused on the revocation of a specific game's rating assignment, we formally stated that any pertinent content shipped on the game disc that may be relevant to a rating must be disclosed to ESRB, even if it is not intended to ever be accessed during game play.

Publishers have until Jan. 9, to disclose all hidden content in games that could adjust the title's rating. If another Hot Coffee incident occurs publishers will face "corrective actions."

Corrective actions sound like a nun standing over your desk with a ruler. My hand hurts just thinking about it.