3DS. The console Zelda games have been coming in towards the end of the console cycle lately (TP, and now SS). They need to fix this and have the Wii U Zelda out soon, maybe late 2014?
However, in all likelihood, expect a 3DS Zelda first, maybe as early as late 2013? Portable games are still somewhat easier to make than console games.
Also, I'd expect another remake on the 3DS before it's lifetime is over. I'm slightly surprised we haven't heard anything on MM- it'd be easy now than ever, with the OoT remake's assets still lying around and all.