UPDATE: Codemasters has no idea why this was listed.
Update: Codemasters, the developer of DiRT, says it does not have a product in development for Wii U.
DiRT has been listed for the Wii U on Amazon.
Orignally shown in a sizzle reel during the reveal of the Wii U at E3 2011, Codemasters has been very quiet concerning the game since then. There has been no official word confirming or denying this listing.
It is not yet known whether this is an original game for the Wii U or a port of an existing DiRT game.