HyrulianScrolls on 05 November 2014
Because it is a time honored and respected tradition for Nintendo to troll the fanbase when it comes to teasing new Zeldas.
In all seriousness though, it's because in both Gamecube and Wii U's case, Zelda was a good franchise to showcase the potential graphics of said systems in pre-system release tech demos. But when they actually started making those games they realized those art styles didn't fit the games being made.
