Jake Tapper on CNN just reported "breaking news" about the case.
He said that apparently the family was held hostage for hours, and mentioned the housekeeper's husband visiting the house and pounding on the door without getting a response. Then after he returned home he received a message from the husband stating that the housekeeper would be staying overnight.
DC police said they are getting tips in based on the video that was released.
They mentioned that the call and text to the 2nd housekeeper telling her not to come in might have been coded. She said she thought it was strange that they contacted her like that, so she called the house but no one picked up.
Investigators are being "hoisted up" to the cameras on the corners of the house to examine them. Harry Houck, Law Enforcement Analyst, stated this was not a random crime, and that family has been ruled out already.
It's either a retribution crime, or a robbery/homocide. Houck is leaning towards the latter, but says the location where the bodies were found will be crucial information. He also mentioned they may have been waiting for money to be delivered, or that they were searching the house for valuables.
He said the hired help would have crucial information about the home, manner of entry, and the contents, so "the police are certainly looking at that". The police will want to know if the cameras were turned off ahead of time. He brought up that the vehicle was left near the father's office, which might not be a coincidence.
Houck: As a detective, I don't believe in coincidences.
He tends to think the killer and the family knew each other, and that is "why the family is dead".
(Not sure if all of this is new info, but Jake Tapper presented it as breaking news.)