Watch Dogs has spawned two DLC content packs, though neither are the meaty Bad Blood mini campaign.
The first DLC pack includes the Conspiracy digital trip originally released for all of the other versions of Watch Dogs nearly six months ago. Each digital trip is a mini-game within the Watch Dogs world with Conspiracy seeing Aiden Pierce stalk killer robots that are invisible to everyone but him. The eShop also now hosts the Access Granted DLC pack, which compiles the costumes, weapons and perks first released as pre-order content for the game's other incarnations along with three exclusive contract missions.
Unfortunately, as far as Watch Dogs DLC goes, these two are relatively minor and Ubisoft has publicly stated that the crown jewel of the game's additions, Bad Blood, will not be coming to the Wii U. No reason for the omission was given at that time, but it's likely because the publisher has little faith in Nintendo's console.