Well, they're married, and they usually generate ideas together (albeit never directly... they email everything to each other). This might be a bit of a different situation, though. She urged him to take this project on (and never mentioned anything about her potential involvement in any interviews) and might have some projects of her own lined up at the moment. Him tackling an established franchise like this might create a bit of a different working environment.
Correct me if I'm wrong, I don't think she was ever involved with Halo during Blomkamp's time working on that.
