DFW-FRA on Sunday 1/27 has also just switched to a 20J config. It was still showing the old config as of yesterday.
I was booked in MCE since no PE available in the original config and could not use/confirm SWU.
Glad I checked in close to the 23:30 mark and saw the change - grabbed a seat in new PE cabin (7J) as they're all showing as MCE on the seatmap for this flight.