In a nutshell, the episode was just going over the whole story again, but with much more detail over two hours. Dan's parents were interviewed, which was something new. Interrogations were shown with many of the major players, and the dude that shot him (allegedly) that's still set to go on trial had his lawyer on there as well trying to explain away his role in the mess.
This episode made the crazy ex wife's family look horrible (and rightly so) just by presenting the facts. They even showed pictures of the brother and Wendi out having a good time with Katherine Magbanua. The undercover FBI operation with surveillance and recorded phone messages was on the episode as well. It may not directly link the family at this point, but the implications are damning. There is a special place in hell for this family. I don't know how they can look at themselves in the mirror. They are just bad people.
Still can't figure out why Garcia or Magbanua haven't rolled. I'm sure there's a logical reason, but I'm not an expert in these things. I would have given it up by now, I don't care what the family had promised.