Sony's announced on the US PlayStation blog that today's PSN update will include an app called the MGS4 Database. From the site:
The MGS4 Database is a free, downloadable interactive application that contains the official knowledge base of everything that is Metal Gear, reaching all the way back to the very beginning of the franchise. Including complete storylines, character profiles, relationship diagrams, and much more! The MGS4 database is a great way to catch up for someone new to Metal Gear, as well as a useful resource for any veteran of the series, with complete official details on every aspect of the intricate Metal gear lore.
The MGS4 Database also contains a special feature – if you want to make use of the database, but have not yet fully played through MGS4 yet and are worried about spoilers – all MGS4 spoilers are “blacked out” until you’ve beaten MGS4. Give it a try!
But that’s not all, within MGS4, check out the EXTRAS option of the main menu (if you haven’t already). There’s already new, free downloadable content available for the game - with new camouflage and a new music track for the in game iPod. There will be more forthcoming, so be sure to check this often!
No word on whether or not this is going to be included in the European update, so keep everything crossed.