The quote says, "new", "from investigators" and, "don't disclose to public".
This doesn't sound like results from the FBI or other labs unless use of the word investigators is a ruse -- so no fingerprints or forensics. IMO.
So either someone has come forward or, something has turned up from LE or, there is a DC connection.
I would think that for not disclosing to public, if it helps KC then it would go to the Defense and they'd be able to use it, obviously.
However, if it goes against KC then the Defense will still discover but the Prosecution don't want the public to know since it would taint any Jury if it still goes to trial.
I would discount it helping KC since the Defense would use that either way both at trial and before .... it does sound like bad news for KC as well as maybe one of the A's. Intriguing.