I received one about a week prior to my departure for a DCA-DFW-HKG leg which I flew last Wednesday. It was $745. I had already waitlisted for a SWU on the flight. My upgrade from DCA-DFW cleared two days prior to departure and my upgrade for DFW-HKG cleared the night prior to departure. I think I remember glancing at the upgrade list at the gate prior to boarding, which was about 30 people long and seeing that 10 or so had cleared, with one being out of order which I assume was a J->F upgrade.
Great crew on DFW-HKG made the long flight pass by nicely with some great chats in the galley.