PS4- A new Jak game. Could be a reboot, could be a new story arc, but I want Jak back.
Wii U- Star Fox: Mercenaries, as a blend of space fights and land exploration, in the spirit of the Ratchet and Clank games. Would have the Star Fox team fully playable. The Great Fox would act as a hub, where the team would receive missions. Some would take place in space and be like Star Fox 64, others would take place on planets. The ones on planets would sometimes be exploration heavy like Adventures, and sometimes action heavy like Assault. The main story would be driven by one string of missions, while each planet would have multiple side missions that would eventually make you famous on each planet you completed them all for, much like Skyrim where you could become the Thane of each region through side quests, while the main story was its own string of quests. The game would retcon Command just as 64 retconned the original, leaving Command as a sort of "what if" alternate universe scenario like comics sometimes do.
Xbox- Conker's Bad Fur Day: Conker Goes to Hell, a sequel to the first game. Completely uncensored, unapologetically offensive, absolutely hilarious. Remember how in the first game, squirrels supposedly could come back to life if they had more tails? And remember that the one unresolved part of the story was that Conker couldn't save Berri? In the new game, Conker gets his girl back, by making a deal with death, and actually going to hell and bringing her back. Conker goes through the nine circles of hell, each acting as a different world themed with different depravities.
Vita- Ape Escape reboot, one that actually plays like the original games, instead of some weird party game.
3DS- A game that makes better use of the AR capabilities of the 3DS. It's something unique to the 3DS, and it's almost completely unused. You've got those AR cards sitting around that came with the system, you've got Face Raiders, you've got Spirit Camera, and you've got a bunch of e-shop exclusive titles. All really tiny, often shitty uses of AR, not using the 3DS to its full potential. A grand scale AR game could be anything, even something of a completely new genre of game, the possibilities are endless, so much untapped potential. Nintendo tends to eventually use it's systems' potential, it just takes them a while. It wasn't till near the end of the Wii's popularity that Nintendo made the Wii Motion Plus and Skyward Sword, and they've yet to really use the Wii U gamepad but have said they now plan to with future titles. So I think it's realistic that eventually, Nintendo will make better use of AR on the 3DS. They've dabbled in it so far, but before the 3DS dies out, we'll see something from Nintendo to make better use of AR, I think.