Two big things I would like in future games are SWTOR-style group conversions for multiplayer and having the option of having a voiced pc!
I would like to see companions and romances continue to evolve from BG3 as well, so that there is more variety and depth.
More origins like The Dark Urge, where you have a background and story connections but can otherwise customize your character, would be great!
More reactivity would be great as well.
I love BG3 in general, so I am looking for more of the same but with improvements rather than a complete change!