also got an OpUp last night, on my way back. strangely, seatcounter.com up until 24hrs before the flight showed a pretty light load, but at check-in the agent told me it was a full flight when i asked.
before i had the chance to ask for an OpUp, she said "i'll get an upgrade for you, sir." sweet. and sweeter that i was on the right side of the cabin where there was a very lovely FA from malaysia. (sigh)
verdict for this trip: i was very lucky to have gotten 2 OpUps on the same itinerary.