If it's going to be a repetition of the document that has been out in the open for years, then the charges will probably be related to concealment of crime, obstruction, destruction of evidence, abetting the killers, etc., rather than murder, as the four mentioned are dead...
It would certainly be very interesting, though, if there was someone still alive who had been directly involved in the crime.
And maybe they will finally address that silly photo openly. A wacky prank photograph, staged by a sister and brother, is still idiotically pushed as "the haunting photo of kidnapped Tara Calico". They won't mention it, but they should - it might shut up 1% of those who still keep bringing it up.
(Well, to be accurate, the photo is often pushed idiotically, but, even more often, it's done knowingly and maliciously, for monetary gain of collecting "clicks" on trash filth like: "THE 10 MOST CHILLING PHOTOGRAPHS OF KIDNAPPING VICTIMS! (NUMBER 7 WILL SHOCK YOU!) EVERY PHOTO AVAILABLE AS T-SHIRT AND MUG, SUBSCRIBE TO OUR 'HUGE GRIFTER SAYS HE INVESTIGATES' PATREON AND BUY OUR MERCHANDISE!")