Boeing will analyze the flight test data and expects to conduct the one and only certification test flight using the same aircraft in the next few days with FAA personnel on board to observe the test. Further, according to the Wall Street Journal, Boeing will ground test the lithium ion batteries on board ZA005 (LN 5, N787FT), which is also equipped with the new containment system, to failure in order to ensure that the containment system works as advertised. Even though Boeing has said that they will fly only one certification test flights, the FAA may require that Boeing fly more certification test flights as they deem necessary.
Boeing is still very confident of the system they have designed that they have not slowed down 787 production and anticipate resuming production flight tests in the very near future though I don't know when that will be. It would certainly take place after Boeing fixes the 50 787s already delivered before retrofitting them on the aircraft on flightline's at Charleston and Everett. It would probably take Boeing at least 2 months to return all the 50 787s to flight once FAA approval (as well as approval of the other global aviation authorities). The Japanese aviation authorities (and others) may ask Boeing to carry out further tests to satisfy their own requirements thus delaying the resumption of service of the fleet of 787s outside of the United States.
Even though Boeing doesn't discuss their testing schedules, I do expect that if there are no issues from the data of this test flight that the certification test flight should occur by Friday or Saturday at the latest.
Currently, Boeing has 27 completed 787s awaiting delivery. 21 are at Everett and 6 are in storage in Charleston. They're still adding one aircraft per week.