That, and the fact that we will get to see a battle with the new type. I don't think it'll be that exciting or different, but I wonder how they'll explain it as well. If they do bother to take some time to explain it, that is.
They most likely will explain it given how Fairy-type is mentioned so much in the info about the episode. Plus the type is new to Satoshi so there will definitely be an explanation about Fairy-type weaknesses and strengths. The question is whether or not they will go into detail about it being theb"newly discovered type" or if they will pretend like the type has always been there.