I really hope that the game stays as far as they could from NWN. The only party you have in NWN is when you play multiplayer. Your companion(s) have barely more personality, interaction and utility than your summoned skeleton.
If I wanted that I will search for Skyrim 2 (TES VII), not BG3.
BG however is a single-player only game, this one, like NWN, will feature multiplayer. I personally hope they emphasise the Hero dimension, rather than the Group dimension.