I'm wondering if it is a sequel to the game like Black and White 2, or it happening in an alternate universe but rather following a Crystal to Gold and Silver. I'd very much like a sequel and an expanded version of Alola like how BW2 brought to the table.
My guess is on sequels, with Ultra Sun following Sun and Ultra Moon following Moon. It makes the most sense on why they'd even go with the same names. If you're going to tell a plot unrelated to that of the original Sun and Moon, why go with the same names? I hope we'll get some more trials. Finding Icium Z on the side of the road is just unrewarding and cheap, makes me feel like how Ash felt when he first got to Volkner's gym in Sinnoh in the anime.
Personally, I think sequels are better than a possible Stars version which, if it was following the trends of Crystal, Emerald, and Platinum, would still tell the same overall story with some changes here and there. A true sequel has more room to differ, surprise, and actually expand the universe.
Could be Z-move Mimikyu
I hope it is, Mimikyu's amazing. Maybe something based on Shadow Claw.