It's the Year of Luigi indeed. Nintendo this morning announced that Luigi will be getting his own expansion for New Super Mario Bros. U that features new, alternate versions of NSMBU levels. These levels of course will tailored for Luigi though players can swap between the two versions of the stages "freely" whatever that means.
Take a look at a trio of screens and read on for the details.
New Super Luigi U screens:
To continue the fun of New Super Mario Bros. U for Wii U, Nintendo is letting Luigi take over in new downloadable content that is coming in the Year of Luigi that provides alternate versions of the game's more than 80 stages. Players can freely change between the New Super Luigi U and New Super Mario Bros. U stages. These Luigi-focused stages provide a whole new level of game-play challenge and will be available for purchase as a single download.