This happened to me too, with two C-class award tickets to LHR in August. I called and they said that the non-stop has been moved from a 6pm departure to 1:30pm, but that it still exists. The flight number remains the same. It woud appear that the computer automatically re-booked everyone on the later connecting flight via SFO to more closely match the original departure and arrival times. Of course, they were happy to re-rebook me on the non-stop at the earlier time. Interestingly, .bomb still shows the flight at the originally-scheduled time, but presumably this is yet another glitch with the website and it will eventually show the new time.