Soundwave on 29 September 2014
Nintendo will support the Wii U through the end of 2015 and then phase it out as 2016 moves along. The next handheld (Fusion) will launch in 2016 and that will take the majority of their software development.
I think the ease the transition, Nintendo will give Wii U owners some kind of "thank you" bonus when they buy a Fusion, like a free game from the eShop.
Nintendo really doesn't support their consoles for 5 full years anyway, it's usually 4 years of "real" support, the 5th year is usually a write off. They basically ditched the GameCube after early 2005.
