I doubt they will do anything other than release him. He hasn’t broken any laws. But right now a lot of police are in a CYA mode, scared that they will let a real nut loose, and he will promptly try to kill a bunch of people.
If someone can maintain for a weekend in the equivalent of a padded cell, but much nicer, it is highly unlikely they are a threat.
now it gets interesting, he had his hearing and they decided to hold him for 30 days on a Mental Health warrant which normally has a pretty high bar to reach. More details here.
http://www.examiner.com/article/brandon-raub-not-released-following-hearing