Nintendo announced today that it will include a "play control system" in the Nintendo Revolution (still being called a code-name). By using a password-controlled setting, adults can decide what flexibility they'll allow younger players to have in playing video games rated E (Everyone), E10+ (Everyone 10 and Older), T (Teen) or M (Mature). The system also ensures that those who don't want to use it can opt to play without limitations.
Nintendo was quick to point out the fact it doesn't create Mature titles and the announcement does seem to indicate that such titles are important for the companies hopes for the Revolution, providing the scope for third-parties to bring such titles to the format and removing the childish image that thwarted the GameCube.
News source: TVG