I absolutely love turn based battles in Pokemon, I wouldn't be happy with something else, all I need from battles is better animations/scaling, apparently in these games battles are seamless ie no backgrounds you just enter into battle, also if a trainer run out of pokemon apparently they get attacked directly by the wild pokemon which is very interesting, also from what I understood re catching mechanics, the sneaky catches look like they are mostly vs weaker mons while you'll have to weaken the strongers ones.
I'm interested in if they will add quests to how we are going to research mons for the dex and stuff like that, I'm hoping the mons standing still is just pre alpha footage and this will change on release and research might include looking at mons in their natural habitat and how they act, as well as what they are adding to the lore of Arceus and what that story will look like.
There's definitely a lot of potential and it looks like "Legends" might become its own series since in the trailer the sinnoh one is book 1 from 3, I'm not expecting perfection or even something great, just something fresh that can show off the potential of where this series can go is enough for the first entry for me.