8 would be a huge disappointment. I want to be able to put together an entirely good party and that doesn't seem possible with 8 that are mentioned. And this is just PR nonsense:
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They plan to have eight companions, possibly more, and potentially including companions that won't be origin characters There will be more companions than DoS2 but possibly less than BG2. Part of the "less than BG2" bit is because they want all the companions to have fleshed out stories
Minsc is not going to become any more fleshed out than he was in BG2 -- he's a big, dumb good natured one line factory who looks to others for guidance. He a good friend, someone you know he always has your back. If you flesh him out too much you ruin him.
The Jaheria romance had a wall of text and a number of quests that only happened if she was in your party -- the idea that the BG2 characters were as shallow as the DOS2 characters is nonsense.