I remember all of the brouhaha over Kerry not releasing his military records, and the upshot of it was that they revealed he got lower grades than Bush while in college. BFD.
Probably so -- I seriously doubt there's anything to the 'citizenship' angle, but his reticence in producing the thing is becoming rather interesting.
If you'll hand me Mr. Occam's razor, I would suggest that the easist explanation is that there's nothing at all wrong with the BC; that they're waiting to see if it causes a serious controversy; and if so they'll wait until the Wednesday before the election to release it with, "see? Nothing to see here."
The idea would be to use that non-controversy, with its simple resolution, to provide a smoke-screen for the more serious questions about Obama's associates, past, and lack of qualifications.