Why not? They said they were going to tell us things? So far, zip. Maybe tonight when Greta gets back. If they have evidence that could have helped shouldn't they have reported it already. If she has 'proof' that Natalee made a call from the Sloots at 3:00 am the morning Natalee went missing, what is she gaining by not releasing that information?
"What is gained by not releasing that information?" Must be fear-based. First they threaten to open a can of worms, then something causes them to pull back. This time, just after meeting with an attorney. (Correct me if I'm wrong about the attorney part.)