it's weird to say this, since legends arceus is in my top 3 spinoffs and maybe top 3 pokemon games of all time, but i am just..... not really interested in Z-A? ever since i was a puppy, i was always more fixated on the non-battle activities trainers do; legends arceus focused on pokedexmaxxing, which i always wished was more fleshed out in the main series (there was no reason to catch more than one of a species unless you were going for living dex), and, imo, despite being "open world", it feels much more like each area was separate levels with a delightful amount of detail in each.
Z-A's focus on battling others doesn't interest me nearly as much. nothing the trailers have shown has really gotten me curious, either, though i will say the day/night thing is pretty novel, even if it doesn't do anything for me specifically. i'll be interested in seeing some gameplay once the game is actually out, but i won't be getting it at launch, or anywhere near that, LOL