I'm sure they have their marketing-related reasons. There is some merit to having a cliff-hanger ending to an episode in order to build up hype for the conclusion. However, this droids arc is not really worthy of that, in my view. It has essentially been a pair of standalone episodes of two different genres thus far. The Clovis trilogy, with its rather more "adult" and PT-relevant subject matter and an inevitably more consistent tone than the droids arc, might have been a better choice for a holiday cliffhanger.