AFAIK.... 791 will actually become 791CM when it is put into Op Specs instead of going back to 791AX. Also, I was told it was going to LPLA for work and paint. LIM makes much more sense though. If it is going right into service, I wonder if it's going to fly for Tampa Cargo like 316CM currently is.
Plus is the FCOM revision even in place? This plane is EADI/EHSI like 712AX but is the Fast/Slow EADI (712AX was Speed Tape and PEGASUS FMC). I doubt they are going to spend all the time and money to put IS&S in it.
I bet it will be white with a sticker. I guess 761CX is going to emerge from ILN the same way