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Metal Gear Solid 4 will get a Trophy patch, according to an interview with Hideo Kojima in this week's Famitsu. The magazine does not reveal a date for the patch, but MGS4 is scheduled to receive a budget release in in August, so the timing could coincide with that.
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The interview also reveals that Konami will hold a Metal Gear Solid 25th Anniversary Event on August 30 at Tokyo Midtown (the office complex that houses Konami's main office). There will be some sort of announcement at the this event, Kojima reveals in the interview. This announcement is apparently related to the vision he's previously shared about a game that connects people. Peace Walker's "Transfarring" component served as a test for this vision.

Update: This report does appear to be true! The Trophy support will be included out the box with a 3,990 yen "PlayStation 3 The Best" budget version of MGS4 in August. Current MGS4 owners will be able to patch their copy of the game.
http://andriasang.com/con1vt/metal_gear_announcement/