Story that I was given this morning was after a crew meeting which announced tickets for USD$10 to watch the first flight...............they then announced the delay.
Some were saying it may even be related to the repairs after the hydraulic failure that have been the cause for concern. which would not be a good thing to blab in the media. So whether its a genuine structural modification or a repair procedure gone wrong, its not good for the image of the 787. And there are still lots of very tight lips on the factory floor
But all things in perspective, the A380 had some pretty good and some spectacular cockups delaying its launch and delivery.