soundofmusic.de's customer service told me they weren't giving any reason for the delay when they pushed it back to August. Even with all the negativity and uncertainty, it's there #2 seller right now due to the pre-orders.
I personally think there's just enough interest in this to release it. A lot of the people who are asking about it are not the fans who did see the show, but people who really wanted to but didn't have a chance when it closed. Some of them had tickets, some had waited because it opened at a time when they had things like college and such to deal with.
I know last month I was waiting for a friend outside the Palace and the signs were still up. If I had a penny for everyone...mostly tourists...who say the signs and walked up to the door to either find out more or go in and see about tickets...I'd have almost enough money to finance the release,
http://www.hugh-panaro.net