I made two bookings to the same destination; one revenue, one award. Received notification of a flight cancellation on the revenue booking, absolutely nothing for the reward booking. We're talking a wholesale change of the itinerary -- both segments are affected and we need to be at the airport several hours earlier than we had originally booked.
This isn't the first time I experience these kinds of changes to a reward booking, and not once have I actually been notified. Classic case of "buyer beware."