Also, I don't think those Rock barriers are inexplicable. They could be a coral reef or coral chain of attols/islands. Those are explaianable as forming around an island in rings like that, depending on the topography.
But yes, the graphics are awesome, I am glad we have a first person-ish camera view, actual human proportions in the overworld instead of chibi forms, and of course, the tropics are paradise.
The Professor, if the fat guy in the blue vest and yellow flowered shirt thingy is indeed the Professor, is badass. Looks like a retired Samurai on vacation, which he probably is. I mean come on, a Professor who doesn't wear a labcoat or suit is awesome by default!
Also to be noted is that we are introduced to the Hawaii-ish region by a cousin. Not Mom, or even Dad, but Cousin. This is huge. Unexplained orphan much? Or is Mom the E4 and Dad the villain?
My views on the starters:
Rowlet is adorable and has a leaf bowtie. +30 appeal. Unfortunately it has a bad typing, but we'll see how it turns out.
Popplio is even more adorable, and it goes "BWARK". Enough said. I hope the sea lion gets all the circus moves, like Belly Drum, Acrobatics, Encore, Rollout, etc.
Litten is unremarkable. If it ends up as another Dark/Fire like it looks I shall have pleasure in destroying it with my Mega Houndoom. Too many damn cats.
Speaking of too many cats, the Sun legend is just Mega Pyroar. Awesome, but already done as a concept. Moon bat is just so....confusing. It is overdetailed in my view and doesn't really look that good. I hope it's Dark/Fairy with Levitate, because that'd be awesome, despite it looking like a legless Mega Salamence gone wrong with a Yveltal and a Golbat.
I'm hoping for a Dolphin Pokemon, above all else. If we don't get one now we are never likely to get it.