What In The World Is Metal Gear Solid: “Piece” Walker?

Konami built a separate website for something called Metal Gear Solid: “Piece” Walker with a picture of Snake hiding in a cardboard box saying “Piece Walker coming soon…”

At first, I thought this might be another hub for Metal Gear Solid: Peace Walker with a pun indicating the site is being built in “pieces,” but Konami already has a Metal Gear Solid: Peace Walker portal which has a link to the “Piece” Walker page. Click on the cardboard box to get over to the Piece Walker pre-site.

Any ideas on what Kojima Productions is teasing this time?