The producer behind New Super Mario Bros U, Takashi Tekuza, has teased DLC options for the Wii U game in the future.
Whilst Mario's outing on the Wii U boasts a solid solo campaign, variety of multiplayer features and challenges, Nintendo don't want the experience to end there. Tekua confirmed in the latest Iwata Asks roundtable session that Nintendo are "planning additional courses", but are trying to "think of ways of play that are different from New Super Mario Bros. 2".
The functionality is already in place, it's just down to the team to whip up some content for Wii U players to download.