I own a Wii U. Do you know why I held out on buying one for so long and why Nintendo hasn't gotten any money from me since? It's because THEY HAVE NO GAMES! They have six freaking studios and nothing to show for it! They haven't even previewed any upcoming games!
Borrowing a line from Iron Man, They're a Game Company Not Making Games! It's not freaking rocket science. There's no defense for Nintendo - they have a huge catalog of franchises to call upon and revisit and they're sitting on all of them. Make a freaking sequel to ANY of them! Use the same damn engine - who cares? I don't need anything revolutionary - it doesn't need to be beautiful, it needs to be fun. Which I realize isn't the easiest thing, but it seems like the only thing harder than that when you have such a talented team of game makers is to NOT MAKE GAMES, but somehow they're managing it.
What the heck are you talking about? They have Mario Kart, Super Smash Bros and Donkey Kong coming in the near future, all of which have been previewed regularly. They will also reveal the new Zelda game pretty soon.
The Wii U currently has 200+ games, among them one of the best Mario games ever.