This thread seems to be starting to be a lot of uppity against eachother and allegations of ignorance, shallowness and other lingo in either directions.
Let's stop that.
The current status quo is a vague statement of:
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Recruited companions will be at camp when not in the adventuring party, and can be swapped in and out at camp. After the first act however you are going to have to commit, also just like in real life.
Though I do remember some mentions of henchmen, so from my impressions there might be ways to change around and add some new blood to a party after, just not the companions with individual story progression attached to them. But I was never a fan of that in DOS2 either, so I'm hoping that party progression as a whole gets a redesign at some point. Not a deal-breaker for me though ^^