Either that, or the judge is trying to maintain an “uncontaminated” jury pool.
http://stream.wsj.com/story/colorado-shooting/SS-2-34741/SS-2-34748/
I could be wrong but I dont see this as anything particularly unusual in high profile case like this with an on-going investigation. The cops probably dont want the media to follow them around as they issue search warrants and interview witnesses as they are putting their case together.