Yeah I also don't think it is a full filler arc. I think this is an arc where Naruto will become much stronger and also I think they are going to introduce a new jinchuuriki, that will become friends with Naruto or at least come in contact with. (I don't read the manga, so I can be totally wrong, but this is my opinion). But I also think it is partly a filler arc, but hey else naruto shippuuden would end too soon :p
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