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Alright fuckers, listen up. Both sides of the 6.5/7 debate are right. Sun/Moon are both going to be similar to Gold/Silver/Crystal in that we'll be starting in a new region, but after completing the new region we'll be able to travel back to Kalos.
This all makes sense. The unreleased Pokémon, the different forms of Zygarde, the colors and shit on Zygarde's chest, the hints in X/Y, and the lower part of France being hinted at.
If this isn't what Sun/Moon is going to be, I'll be severely disappointed. GF realizes that HG/SS was easily the fan favorite because of the length of the endgame. They tried to emulate it a bit by adding larger regions, but they've realized the formula they used with G/S/C and HG/SS was perfect.
Two regions, new mon, and completion of X/Y's missing characteristics/unobtainables.