France Konami has released some info of the new MGS4 25th Anniversary Edition which will be released in Europe on November 29, 2012 . This new version will be included the recently new added Trophies and a double-sided 25th anniversary exclusive poster created by Yoji Shinkawa. Sadly, there won't be any new game content.
European retailers Zavi and ShopTo have listed Metal Gear Solid 4 25th Anniversary Edition on their online stores.
Source: Metal Gear Solid Aimgehess