If you think of BG 3 as BG 5e then it's easier to mover on from old expectations for BG 3. Even on the days of the Black Hound it wasn't a continuation of BG 1 &2 & ToB plot, which was resolved.
5th edition D&D rules are a 100x better then 2nd edition D&D rules. In 5e no class is race restricted, the multiclassing rules work way better and smoother and functional then in 2e. You have some really cool feats in 5e like Ritual Caster and Warcaster. Low level wizards aren't boring and nearly useless in 5e like they are in 2e, fighters are more fun at all levels then 2e. You have new classes in 5e like Sorcerer and Warlock with fun mechanics and flavour.
Subclasses are baked right into classes in 5e.
You have subraces right in the PHB in 5e.
You have advantage and disadvantage in 5e.
You have Dragonborn in 5e.
You have backgrounds in 5e.
Baldur's Gate itself is far more interesting in the current era then in 2e's times, with new districts like Twin Songs and Little Calimshan.
Its more likely to be turn based as you can't do RtwP with proper 5e rules and TB is better then RtwP.
There is an absolutely huge team building this game, over 300 people.
BG3 will be the first FR video game to have a Nautiloud since that Spelljammer: Realmspace.
Much better graphics.