User blog comment:Jkphantom9/World of Remnant this Thanksgiving Weekend, Vol 4 Episode 5 will air next weekend/@comment-28288412-20161122231022/@comment-25396609-20161123011552

It says in the post; they're releasing a WoR episode (which take less time and effort to make than standard episodes), in order to give the crew a rest for thanksgiving.

Generally they are polishing new episodes up to the night before release, so by releasing a World of Remnant the crew gets to take a holiday and not have a last minute rush after to finish the episode befoe saturday.