I guess we can rehash the Strange Souvenir in Pokemon X and Y and bring up more speculation.
If you recall…we can get a Strange Souvenir from a backpacker in the Hotels. When you see him 4 consecutive days in different hotels he gives you this item saying it's from a region not know to people here. Not Kanto, Johto, Hoenn, Sinnoh, Unova, or Kalos.
Looks like it is from Sun/Moon(Gen 7) and we'll have another tropical type region(similar to Hoenn). To be more specific I think it'll be based on Hawaii. I can break down the video for you guys who didn't put the hints together.
But lets keep talking and getting the pokemon speculation going!