The playlist;
Code:
http://www.southparkstudios.com/feeds/video-player/mediagen?uri=mgid:arc:episode:southparkstudios.com:e62d5b20-ed00-11e0-aca6-0026b9414f30&suppressRegisterBeacon=true
doesn't list anything higher than 1280x720 @bitrate="1200". I haven't seen anything higher in any other platform access method either.