Downloadable content is simply the way of the world now; it's up to game creators to keep it creative, and consumers to remain discerning as to where their money goes. Nintendo got into the paid DLC game with New Super Mario Bros. 2 on 3DS (and Fire Emblem: Awakening in Japan), and the company is now trying to figure out what to do for DLC on New Super Mario Bros. U.
The DLC on NSMB2 was pretty specific to the coin-grabbing game's particular hook, so Nintendo is approaching things differently on Wii U. Takashi Tezuka, general manager of Nintendo's EAD division, says, "We're trying to think of ways of play that are different from New Super Mario Bros. 2, but we haven't made anything yet."
Nintendo President Satoru Iwata chimes in: "Right, rather than distributing content that's premade at a later date, you're going to start working on it now."
What would you like to see as DLC for New Super Mario Bros. U, if anything?