Seems more likely the next big Mario would be 2014, along with Smash. HD Zelda in 2015.
Have absolutely no clue what they have lined up for 2013 but Nintendo does have a habit of announcing games months before they come out, so who knows. Time for the fabled-but-will-almost-definitely-disappoint-because-lol-Nintendo-online-yet-it-will-sell-gangbusters Pokemon MMO?
Or Mario Kart. It's probably gonna be Mario Kart. Still, that might be exciting because Wii U has better online than Wii, and MK Wii was rubbing up against those limitations in multiple areas. MK Wii was also supported years after the fact with events and trials, if they keep releasing new tracks and chars as DLC for a few years that might be pretty cool.
Actually, to make the droughts seem less dry they might do HD Collections. They did a bunch of rereleases of GC games for Wii and those were barely worth it, but HD collections... those would definitely be worth buying, depending on the game.