In my honest opinion, the prosecution cannot give out any more details of the killings because there are still three cases as yet unresolved. They can't tip their hand and give all the details because BW, AW, and GW may still go to trial. Just because JW entered a guilty plea does not in any way mean his father, mother and brother will. I would not be surprised if AW and GW end up pleading guilty, but I'm not so sure about BW. His temper and impatience have been clearly demonstrated in the last few months, and I would not be too surprised at all if he decides to go to trial.
IMO, it will be business as usual for the prosecution team until those three cases are resolved. If, and only then, will AC show all her cards. Even then, all the details may not be released out of respect for the surviving loved ones. I think we will find out many, many more details after the four murder cases are resolved but not everything. Again, JMO