Speculating the other direction I would assume that RedHat would reveal details that compromise the security of their users. In fact I think to say they wouldn't is very rude.
The management has reasons for doing what they did, to assume the worst and say trust is out the window is just silly. There are very likely to be mitigating circumstances on revealing details. The FBI are likely involved as just one. It would be irresponsible of them to reveal details that aren't going to affect user security but could compromise the investigation or possibly they don't even know the details. Frankly RedHat is a great FOSS company, they deserve some time to get to the bottom, and they deserve trust that they would communicate any details that could compromise user security. I trust them, and I think it's premature to rip into them.