The following info comes from a source intimate with esports team management and a source close to Nintendo...
"I know Splatoon was a test run for a competitive game, so they're either gonna flesh the current game out, or do something for the Switch."
- organizations heavily identified with eSports have been in contact with Nintendo as far back as Dreamhack Austin
- European and Japanese competitive teams were in contact as well
- Smash Bros and Pokken Tournament are titles being explored for the esports space.
- teams named included TSM, Team Liquid, and Immortals from North America, as well as G2, SK, Fnatic, and NaVi in EU
"From what it sounds like, they aren't looking to make a LoL, CS, or Overwatch. They don't want to be a front-runner; they just want to be a part of it."