The talk of the Metal Gear costumes was not the only thing coming to LittleBigPlanet in that area. It turns out that they are making an expansion will contain more than just costumes. It will have a 5th Sackboy costume (the Gurlokovich Soldier), 72 New Stickers, 12 New Materials, 10 New Decorations, 18 New objects, New background music track, 3 new interactive music tracks, New Metal Gear Solid themed ‘sound object’, New Plasma Ball ‘danger element’, New Laser Sight ‘gadget’, New functioning Searchlight lamp, the new Trophies to unlock and the Paintinator and Paint Switch.

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As for a list of the trophies if you are really interested.
Silver

Speedy Rexecutioner: Destroy the Metal Gear REX boss in under 2 mins 30 seconds

Virtual Survivor: Achieve a score of 3,750 in the VR Survival Challenge

Bronze

Rexecutioner: Destroy the Metal Gear REX boss

METAL GEAR SOLID® Booty Master: Collect all of the METAL GEAR SOLID® prize bubbles

Paint Sharer: Publish a level containing the METAL GEAR SOLID® Paintinator Powerup

QuickFire Artiste: Fire 40 paintballs in under 5 seconds

Ace Act 3 and Act 4: Ace Act 3: The Mission and Act 4: The Level Factory

Ace Act 5: The Boss: Ace Act 5: The Boss

Paint Splurge: Fire 5,000 paintballs

Diamond Hunter: Destroy the 5 hidden target diamonds in Act 4: The Level Factory

Thrifty Painter: Complete Act 3: The Mission firing less than 125 paintballs

Source