I have received an email about a change of schedule on a multisegment award ticket:

Change of Reservation

Please note that a time change has arisen in your booking which you can find out about from the updated itinerary. If you need to rebook, please contact us within the next 14 days and we will inform you about possible alternatives. Rebooking requests received later than 14 days after the timetable change do not count as ‘involuntary’ and will therefore be subject to the original fare conditions.

What has happened is that the times of the US connecting flights at the destination end of the ticket have changed by 20-60 minutes. I take this to mean they will offer me a ticket change (time changes only) without having to pay the fee for changing an award. If that is so, then that's great because I wanted to make a change anyway!