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Mario is going to have to get used to sharing the spotlight, because Luigi is totally taking over 2013.
During today's Nintendo Direct, the company announced a brand-new downloadable content pack for New Super Mario Bros. U, called New Super Luigi U. Apparently this is all being done in celebration of the "year of Luigi" and will feature a relatively sizable add-on.
Nintendo claims it is "similar to the development of full software," and alters the game's levels strictly around the green-clad plumber. The Big N has said that you can expect the pack to be made available sometime later this year.