MSN 5 was towed to P18 on February 24th (almost four months before MSN 6). She appeared on the flightline, in colours, on June 2nd, and now seems ready to fly, though she has not performed her first flight yet.
If MSN 6 followed an equivalent timeline, she would be on the flightline (painted) by end of September, and she would fly in October.
I hope that Airbus' learning curve is steep, so that she makes it to the flightline in August and flies in September.
MSN6 went back to S30 for reasons unknown after P18 tests in April. Whatever they did in S30, it's finished and the aircraft is back at P18, probably to re-check the changes. The next phase should be S20.
So could this be MSN7
MSN7 also went back to S30 after P18, and it is still inside that building.