First I want to say that I am excited for BG3! I have DoS2 to be one of the best games I have ever played, and I look forward to the same quality of game design coming the the D&D universe.
My comment is just to say that I hope that the development team gives a great deal of attention to character models and character animations. From the footage I have seen, the character models are looking good (though limited races have been revealed). At this point, it seems the arrow is definitely pointing up in this regard.
When it comes to character animations, what I have in mind specifically are melee combat animations (spell animations that I have seen look nice!). I haven't seen much of these in the footage that has been released thus far. What I have seen looks OK...though I honestly am hoping for more. What exactly? Well...weapon swings that are cool, not bland...melee abilities that, when used, capture the notion of very skilled and able heroes pulling off amazing stunts. These animations might also vary from race to race (an example of this exists in DoS2, where basic attack animations are different across the races).
Personally, seeing my characters engage in aesthetically pleasing combat animations can often "carry" a game for me...a bad story with a good combat system and combat animations is playable and enjoyable. Now, I don't think Larian will struggle to write a good story, but I am hoping that they partner that story-telling with cinematic presentation of equal quality. There's nothing cooler than watching your heroes kick butt in style!!