Just speculating:

There could be a vulnerability with bitcoin itself that makes (in Danny's words, paraphrasing as far as I can recall them) "our requests seem petty", which would explain the secrecy, but not the part about being legally bound by U.S. laws to keep quiet. It would explain the secrecy because if the vulnerability was exposed, more theft would occur. So they may be fixing the vulnerability with the core dev team, and can make an announcement when it is patched.

To me (as one who doesn't think we are being scammed, at least not by Ukyo and Danny), there's something insidious going on with some hackers and the battle isn't won quite yet. There's also lawyers/contracts involved, possibly gag orders. Two parts to this story we don't know.