I was also on this plane and as a third alternative AB had rebooked me on QR to DOH. Unfortunately I arrived too late at TXL to catch that flight so I opted for the downgrade.

Fog at AUH was an additional problem the next morning; total delay was a little less than three hours.

AB has promised to check for partial refund - which could be difficult to realize as the C fare had been lower than the Y fare...