Following the leak from a few days ago Nintendo has confirmed the existence of Mario Maker for the Wii U. This game will allow you to create and edit levels using elements from the original Super Mario Bros, and Super Mario Bros U. It’s a novel idea and has much potential, with people creating all sorts of things.
When it was first revealed I personally thought this could be Nintendo’s own version of LittleBigPlanet, and considering how popular that is then a similar thing but with Mario should sell loads. There was no news on community sharing though, but this type of game would surely need it to flourish and reach full potential.
No release date is yet confirmed.