Just incase anyone else searches for this question and comes up with this thread, im going to put the answer down. So for the rest of this patch the trial in question wont appear in the duty finder, it appears in the raid finder. This is the "high end duty" portion of the duty finder. Next patch(4.4) it will be moved to the normal part of the duty finder, and whatever new ex trial is added will take its place in the raid finder.