For the first time in over a year I had a GS agent meeting me at the gate and escorting me to board, a surprise. This was for a SEA-SFO flight. I was upgraded the night before. I have seat 3B.
First I got a call while on UC that the flight was boarding and I should come down to board. It was too late for preboarding so I just went to the end of Group 1. A GS agent approached me very friendly, cut in the line in front, scanned my boarding pass, and escorted me to enter the gate. While on the jetway she told me that there was a seat change, and handled me a new boarding pass of seat 1B. I am relatively tall and do not want the bulkhead seat in a A319. So I asked why the change, as I already have 3B and I do not want 1B. She then looked embarrassed and said OK, no seat change.
It looks like that I got the now-very-rare royal treatment of being escorted to board for one reason: to tell me that my seat has been changed. While on board I noticed the gentleman at 1B seemed not in a very good mood.