A soundtrack of the general park music won't be coming in the near future for a myriad of reasons, but mainly because the rights to the "theme songs" used would require a substantial amount of fees that would probably not offset the printing of the CDs and booklets that come with it. There's been many repeated discussions over this (the latter of which can be found here - http://bgwfans.com/forum/showthread.php?tid=283&page=3, starting about halfway down the page).
As for Blackstone, the case of the Illuminights CD is not Blackstone-related at all. It's been planned for a long while already.
I like the CD as it's one of the first modern-day attempts by BGW to market their music. Is it worth what I paid - I'd hope it's worth a LOT more than I paid for it. No no, but really, it's a good CD and I think everybody who's a fan of the park should buy it.