Metroid stuff may or may not appear. Nintendo is announcing something here, we basically know that for a fact, and whether it's Metroid, Star Fox: Grand Prix, Bayo 3 or Smash DLC - it's probably going to be something significant.
I imagine MP4 is a borderline lock to show up in the next 6 months. Don't throw all your hype potatoes into that basket tonight and all should be well.