It's early, but the biggest new feature mentioned in D:OS is that your party members/companions can have contradictory objectives to your own.
That's a cool idea, but does it only work in co-op? Do the companions available in single-player also have the secret-objectives thing?
Can you control other companions out of combat? If so, would you be able to see the so-called secret objectives?
When starting a single-player game, do you get companions from the start? Are they the same companions each time, or are they somewhat randomized (either completely, or a random selection of possible companions is picked)?
Basically, what I'm asking is how do all these party changes work in single-player?