It's the new, spectacularly ugly "placeholder" seatmap which is going to be used for the sUA 777-200ER fleet going forward. Hopefully they will bother to fix the cabin width and show the lavs and door between 7 and 8... by design every seat on this seatmap exists on any frame which might be swapped in, modulo the mess of F/J going to 2-cabin Polaris.
The blocks are all F seats, 20CH, 21BJ, 22BJ, and 35ABCDE. If a PE frame is swapped in, rows 20-22 will become PE; otherwise additional seats may be added and/or unblock when the frame assignment is firmed at ~2am the third night before departure.