As you can see, I'm still really caught up in this. I found this video on YouTube. It is an interview the Joran Van Der Sloot had BEFORE the televised confession. He had no idea what was going to be televised, he just knew it was something he had said. Note that when they make reference of the person that helped him dispose of the body, he doesn't deny it. He actually plays down his relationship with the person that helped him.
Additionally, HERE is a very interesting article that puts more of these events into perspective, including how much involvement Van Der Sloot's father had in influencing Joran's answers to the police interrogation from the very beginning of the investigation.