in april I booked an award flight for a trip to homecoming in october.
i choose a flight that left on thuirsday night after work.
last week i got an email saying that my outbound flight was cancelled (leaving at 6 pm) and i was shifted to a flight leaving at 3 pm.
i took the option to accept the change, as i have no idea what would happen if I didnt.
so i would expect that you would be accomodated on any flight change, but it may also mean that the number of awards seats on that particular flight has now been lowered