Red herrings everywhere, if Nintendo have taught me one thing it's to just be patient and see what happens. Speculate all you like, but don't be surprised if you have been lead down the wrong path, it's just those "clues" look far, far too obvious to me.
On the subject of where Mario can go next, the only way I think he could go is time travel, i can't think of how they'd do it but Nintendo has the time and imagination to pull it off nicely. failing time travel, I'd like to be alternate universes, who wouldn't want to see Mario have to jump into a different parallel universe and meet different versions of himself and other mushroom kingdom characters. Nintendo could do an epic mickey and bring back some forgotten characters and let them have a role in the story.
From zelda i'd like to see a return to normal controls, a realistic art style for Wii U and a cel-shaded style for 3DS, and i'd like it to be bigger than skyward sword which for me was far to small in what it tried to do (Twilight princess had a better story, majora's mask had better characters, and wind waker had a better map. They committed to getting motionplus control to work, which they managed perfectly, but forgot to build a decent game to put it in.)
Metroid I think should play like prime but have a story like other M.
But the games I most want to see are No more heroes 3, Bayonetta 2, what ever monolith soft have been working on, and monster hunter 3U + 4. If we at least get some details on most of them (only monster hunter 3U has a chance of reaching us before 2014 starts) I'd be a happy camper.