I've been following Flightblogger for ages on the 787. It reported a short while ago that the first of them is back out of paint shop and to do the 'gauntlet' tests.
The Road to 787 First Flight - March 24 - Out of the paintshop - FlightBlogger - Aviation News, Commentary and Analysis
In recent weeks either Ostrower on this blog or maybe someone else close to the action predicted the first flight could be back as far as the last two days of June.
Sounds like this might happen sooner.