Shortly after the Wii U's release in November of 2012, a NeoGAF user by the name of Trike found a way to access some sort of debug menu for the Wii U. Listed on the debug menu were a bunch of games titles:
Super Mario Bros. WiiU
Yoshi's Island Wii U
metal gear solid
Final Fantasy 3
Dragon Quest 10
Fast forward two and a half months to February of 2013 and where do we find ourselves? Super Mario Bros U is already out. Assuming Zombie is ZombiU, that's already out as well. A new Yoshi game is confirmed, a new Wii Fit is confirmed, Shin Megami Tensei X Fire Emblem fits the Soul Hackers bill, and we know both Resident Evil Revelations HD and Dragon Quest 10 are coming to Wii U. That's over half the games on the list. Does this give us a glimpse at Nintendo's future plans? Could Retro Studio's new project be another Metroid or Donkey Kong game? Could Ground Zeroes or Metal Gear Solid V be coming to Wii U? What about Final Fantasy?
Also consider, if they are all actually real games you'd have to take into account that "Soul Hackers" meant "Shin Megami Tensei X Fire Emblem." I'm guessing that the farther out from release the titles get, the less literal their names would be. Final Fantasy 3 could just be a codename for the new Monolith Soft game, "metroid" could be a codename for Retro Sutdio's project (considering their previous involvement in the series)...Heck, "metal gear solid" could even be Metal Gear Revengeance.
Frankly, we probably won't know until E3 this year. But it's certainly interesting to consider...