I think the war itself or at least the edo-tensei part of it must be close to wrapping up, so that way when the anime goes back to the story it will be able to showcase the whole saga in one fitting instead of random fillers here and there.
I'm hoping the animators will drag out some of the fights instead of resorting to fillers though, such as Kakashi, Sai, etc, taking on the 7 swordsman of the hidden mist.