For anyone thinking lightning rod mega sceptile is bad, it isnt, at all. It now counters rotom w, and it cant be paralyzed by thunder wave, plus now it has a way of raising its sp attack. That thing is going to be a monster.It just doesn't really make sense flavor wise.
As for mega swampert, when i see it, it just looks like a ball to me. Swift swim seems odd, but hey, i guess it could work. It would need some speed increase however,
Mega diancie seems unique, but thats all the info we got on it :/
Mega Groudon and Kyogre look fantastic, and the way that they are called "Atom Kyogre/Groudon" makes them seem like the megas will be integral in team aqua/magmas plot. The fact that they evolve through "Ancient Devolution" makes me curious.
Speaking of team magma/aqua, the character models for all of them seem great. It was also confirmed that you will be fighting one team based on your game, like the original games. Brendon and May look good (i dont like May's bow on her head, but whatever), and if you look closely, there are screenshots of the overworld, which looks amazing. Steven seems to explain mega evolution with his new "mega bangle" (????), and he seems to have a charizard x, which doesnt make a whole lot of sense, but hey, this raises the possibility of mega metagross.
The acro and mach bikes return makes me happy as well, they can really build on the puzzles both bikes presented.
All we need now is the battle frontier (and mega hydreigon, though it probably wont happen) and I'm set.