I think, they just meant that they wanted to get deeper in the story than before. They will still change it, because they love their games and say what you want about the dual-dialogue of OS 1, but the Source Hunter had a good chemistry together.
Why should they change that now? Especially since we can see, that our companions have very distinct personalities. The same companions we can choose to play. It would kill the mood, if they are the only ones with concrete lines, wouldn't it?
So, just wait, we will get our dialogues.
