Both old new reservation numbers will work for a certain extended period for check ins,
MDE, etc. ADRs and FPs will not be affected. Disney has told TA's there will be a res look up feature on the TA websites, as well as emails to TAs giving all the updated res information in about a week. Phone CMs will be able to look up both old and new res numbers. All room and package reservations look to be affected and will change.
Since you were there and they can check your current res for the bounce back I would assume they will honor BB when the system is back online. Be sure to call the BB phone number on the first available booking day, normal res will most likely have no clue.