Maybe this?
http://videogamecentral.com/gamersvo...g-in-december/
A rumor has surfaced saying that a new extended ending for Metal Gear Solid 4 would be released exactly six months after the games release.
At the end of MGS4 Old Snake says that he has six months left to live. So six months of Snakes life from 12th June 2008 would bring it to 12th December 2008 which is exactly when this extended ending is rumored to be released. The extended ending is expected to be released as an update patch that will be downloadable via the PlayStation Network, or it could even be a code that unlocks the extended ending as the video could already be on the MGS4 Blu-Ray disc.
Until this information is confirmed by Konami or Kojima Productions it will remain as a rumor and unconfirmed. More information as it becomes available.
Imagine if the secret ending unlocks and it's Kojima announcing the port to 360.