ToxicJosh on 12 January 2015
Fingers crossed for Nintendo Direct soon.
If there is a press event though, they may let info trickle out from that and release the trailers on their own; they have before (with MK8 a few weeks before the Direct blowout).
I think if they do a Direct they will announce how MM and Codename STEAM are improved by N3DS, some big screen dungeon footage of Zelda U, an 'announce' trailer for Star Fox, and maybe, MAYBE, a tease on the next Retro project (ie. 20 seconds of ambient music and a title).
