rules are no importance. They are metagame for RPG. I can fit to any rules that are not over simplified. (And NWN interpretation of DND is very limited, especially for RP. But many things can be modded so we had 5x more spells in our server, many of them just for RP purposes).

NWN (DND) has turn based combat. So not much change. It also have pause on demand implemented and next actions queue. No big deal here either.

Also both are not quality defining for me. I don't have "high expectations". Generally not good thing at all. It's Larian game. Not Bioware. But the soul could remain. Rich world (I hoped for big either). Scripted quests with selective outcome. Many side quests with no ability to take them all in one gameplay (due to stat/morale choices). And original, funny if possible, ideas here and there (Larian specialty). Customizable home is confirmed (I liked tower in D2) and I hope it doesn't go for free. And rewarding character progress.