787 Flight next month... PMUA or PMCO aircraft sub?

I am scheduled LAX-PVG in about 7 weeks. Scheduled as 787. flight is currently operated by PMUA 777.

My question is, if the 787 is not back in the air by then, will it remain PMUA 777 will it be a PMCO aircraft (764 or 777) operated by PMCO crew?