There have been threads recently, and I always say the same thing; I would like to see some more classic and one or two old friends again. Most notably Aerie; Minsc is nothing without his witch. And you can return a classic companion who is also kind of a new character as well, since she obviously wouldn't be quite the same kid still recovering from abuse and trauma that she was in BG2. She'll have seen and experienced a lot more, be more confident and independent, maybe even sassy due to hanging around Imoen, less hesitant to fight back if she's bullied etc. Embraced more gnomish ideas and teachings, maybe her relationship with Jaheira evolved to being even more of a mother/daughter type thing where they might argue but obviously do have affection for each other.
That aside, maybe some more narrative focued mini-adventures showing what certain characters did before and after the main game.
