Sometime this year, the New Super Mario Bros. U will be receiving a DLC where Luigi will be the star of the content.
The Luigi-themed DLC pack for the New Super Mario Bros. U is entitled ‘New Super Luigi U’. When it comes out later this year, the DLC will feature new campaign content exclusively made for Luigi. According to Satoru Iwata, the DLC content was a “large-scale’ and will therefore take some time for the developer to make.
So far, no release date has been announced but it should arrive later this year.