Personally I don’t think they usually do release much info, even when a case goes cold, or suspects are found dead. The only caveat here is Stephen Fowler. He knows how his policing system works and what he expects of police in these types of circumstances. If he finds the lack of info suspicious he might well cause enough headache that the police release some info. At this point I’m betting that none of the families have any more info than the general public.
I had a family member murdered and RCMP release very few details to family. The RCMP does not deal in speculation so the family knows very little, except cause of death, investigations are considered ongoing until an arrest has been made.
Mr Fowler works in policing and I can't see any benefit in him demanding RCMP compromise and investigation by releasing information to the public, although he likely has a better idea than most, what procedures are required to build a solid case so his family can see justice served.