In the Federal system, they do that too, but they also, far more often than in State Court, use the Grand Jury to futher the investigation. This kid's friends can tell the FBI or Secret Sevice to pound sand, and refuse to answer any question likely to inciminate their friend. They have to answer the questions of the Grand Jury (or the questions the Assistant US Attorney asks on behalf of the Grand Jury), or face going to jail for contempt.
No indictment after the first time a Federal Grand Jury hears from witnesses in a case is not news. An indictment would have been news, and widely condemned as a rush to judgment.
I was just on Grand Jury for 18 weeks, once a week. We voted to true bill after about 30 minutes of deliberation as long as the prosecutor had their case together.
My guess is what happened here is that IF the case was presented to the grand jury and then IF they voted true BILL it may not be handed up until the session is complete. We handed up all of the indictments at that time except for the high profile cases (cold case, etc...) I cannot see why there would not be an indictment IF the Government can come up with some credible evidence. The fact that they moved in so quick to search tells me that they had some good computer forensics to go on.