Ordinarily, While Collar would have already been renewed for another season and pre-production would be underway. Deadline reports that hasn’t happened because USA and Fox TV Studios haven’t come to an agreement yet. In fact, they supposedly haven’t really been discussing it very much at all.
Word is that season six will likely be the show’s final run but it’s unclear what form it will take. USA is favoring a short season while Fox would like a regular length final season.