What are the plans for the Ares IV mission after the rescue operation? They can't use the MAV that was sent for the mission, because it is in poor shape.

If they send a new MAV as fast as possible to a nearby site, will it be there early enough? Or do they need to reschedule the mission?

Did I just miss the discussion of Ares IV's future, or does the book really do not state anything about that topic?