As I understand it, it was the Ford pavillion music that was the holdup. Apparently the contract under which it was recorded didn't cover commercial release, so Disney would have had to go back and pay all the musicians for this release. Apparently it was too cost prohibitive- and I don't mean cost prohibitive cause Disney doesn't like to spend money, I mean outrageously large sum of money that would never have a chance of being made back. How that could have possibly changed, I don't know.
Here's a thought...I wonder if it being leaked could have anything to do with it being released officially? Seems that if someone in Disney did the leaking, the Company could be held responsible, and perhaps the various unions whose music was basically given out for free could push for a commercial release, no matter the cost to Disney, to ensure that at least thier members benefit from someone at Disney trying to go under the radar. Just a theory.