Nintendo has announced Mario Kart 8 for Wii U. It looks ... great. The kind of shot in the arm I was hoping for.
Motorbikes from Mario Kart Wii return, along with underwater sections and gliding from MK7. It will feature Miiverse features to "share the fun with others," but Iwata wouldn't say what those features are right now.
Mario Kart 8 is coming Spring 2014.