The Last Guardian/WMG

The Last Guardian is a prequel of Shadow of the Colossus

 * The boy in the game is one of the people who used to live in the Forbidden Land, and the creature, Trico, is a young 'Colossus', in a state of life before it becomes somehow tied to a certain area of the land. By releasing it, the boy has messed with this cycle, and this will be part of the 'story'. The title, 'The Last Guardian', refers to Trico itself in that the other Colossi have already been 'tied down' to an area of the world and Trico is the only one who has not. Judging by the size of the world and that the Colossi are all guarding specific structures, Trico was meant to be the Guardian of the central Temple from SotC.

The story will lead into Ico, and reveal how the castle came to be.
The soldiers are the precursors to the Smokemen, possessing armor before merely being the living shadows they are known for being.

Either the boy dies or Trico dies.

 * Bonus points if one of them kills the other.
 * As said in Zero Punctuation Trico is too adorable to survive a Team Ico game.
 * Penny Arcade: Theories.