A quick check on JAL booking engine shows all flight schedules have been updated but some seat maps aren't. JAL probably has to reassign the seats before they can roll out the seat maps one by one. Right now I am seeing correct 787 seat maps on flights on the commencement dates but some Beijing flights still show 767-300ER seat maps while 787-8 is listed in the schedule. Similarly, the DEL commencement flight is still showing a 777-200ER seat map.
After checking seat maps for all three routes, looks like jAL will be using the same E01 configuration used on Boston flights. This makes sense as this will be JAL more flexibility in fleet rotation at least at the beginning when they only have limited numbers of 787-8s.