The thing I've heard from people that have actually played the game is that on act 2 and onwards characters and your relation with them changes a lot.
And in case you don't know there's also hirelings now, wich is also a hot topic right now because they lack the customization people expected.
Also if you really dislike companion there's also a new origin called Dark Urge and I don't think you'll have many companions if you don't mind ''evil'' playthroughs xD
It gets good after 20+ hours? Oof... not a selling point for me.
Been reading about hirelings... so far they look like a bunch of more of the same overly gimmicky.
Dark Urge and Kerlach are TOTAL turn offs to me... more edge lord... "ooh we're EEEEVIL" stuff... no interest.
On the good news front Minsc is back (hopefully with his miniature giant space hamster boo in tow) and Jeheira... more of this please.