Konami has released a new "Metal Gear Social Ops" promotion trailer for Japan.
Metal Gear Solid: Social Ops is a 3D mobile game. It was released for smartphones on December 4, 2012 with language settings for both Japanese and English.
The game involves, game plays and re-enactment from the games Metal Gear Solid 3: Snake Eater, Metal Gear Solid 4: Guns of the Patriots and Metal Gear Solid: Peace Walker however, you move your characters and use it's items and weapons by the use of trading cards, similar to the Metal Gear Ac!d series.
The trading cards involve characters and enemies from Metal Gear Solid 2: Sons of Liberty. Metal Gear Solid 3: Snake Eater, Metal Gear Solid 4: Guns of the Patriots, Metal Gear Solid: Peace Walker and Metal Gear Solid: Ground Zeroes.
Source : Official MGSSOP, MGS wiki