"We didn't discover anything we didn't know about," said Fernando Alonso, senior vice president for flight testing at Airbus. "The airplane is perfectly fit to go into service tomorrow."
"Airbus tried to eliminate those bugs earlier than usual. None of the route-proving flights were delayed, Mr. Alonso said, and only one communications device had to be replaced. Nuisance messages that cropped up are due to be addressed before Qatar Airways starts flying the plane."
I suppose some of the latest tweaks to the A350 configuration may still have to be flight-tested. Some additional flight tests in the certification configuration, which only MSN 5 can perform, may also be required.
Eventually, Airbus has to complete the paperwork for its official application, and EASA has to make a formal final review before granting certification. I read one month may be expected between Airbus' formal application and EASA's official decision.