love the looks of jaheira and not sure if possible if she could return in bg3.. would love to romance her.
She appeared in datamined material (both written lines and interactions with Helsin and items) - so she is likely to make an appearance.
I am still not buying Helsin as a companion due him not being an origin. If Minsc will be a companion/origin, I wouldn't discount a possibility of Jaheira being one as well. That said those would be two "legacy" characters, and that's not something that we have seen in BG3 so far. I haven't seen Larian as much interested in continuing BG2 too directly - or maybe they are keeping those things to themselves for 1.0. I would peg Jaheira for a meetable (important?) NPCs.
Jaheira is a rare with choose a background, just like Wyll, Gale, Lae'zel, and Shadowheart, so that could je a hint they plan to make her a companion.
The game really needs a none evil, attractive female origin character.
Speaking of Shadowheart and Wyll, Shadowheart is straight up one of the best card draw cards in mono black. Wyll on the other hand is the dice lord. First mono red Warlock (Warlocks were supposed to be secondary in red, but then AFR and Innistrad happened). Wyll is going to be very popular in Farideh and Delina decks. Ozolith goes well with him too.