it's going to be a major source of division I imagine.
D&D 5e fans want it to be as close to that game as possible, D:OS fans are going to want it to be more like those games.
Ultimately, it's a D&D game, not a D:OS game, whilst Larian are clearly going to put their own flair on things, ideally it really should be as close to the former as possible. D&D as a truly class based system where the divinity games are very organic, everyone has magic and over the top abilities, which is really fun, but not really in keeping with D&D. Of course, there are also going to be BG1 & 2 fans that want the D&D 2e experience too, I myself played BG1 when it came out and religiously played it every year well into my late twenties. But I recognise the need to update, and am happy to see it be based on D&D 5e.
For my part, I'd like to see inconsistencies between BG3 and D&D5e be removed so that it is as true to pnp as possible.