For my part, I mostly dread fillers...but there's a possibility for something good here. One major thing that gets glossed over in the manga is the other jinchuuriki. We know there are 7 others running around, but we never get to see more than a glimpse of them before the Akatsuki come rumbling in. I'd like to see more about them. What can they do? What kind of people are they? Are they all batshit insane like Gaara used to be, or do they hope for something more? I feel like we got into a rush in the manga over all this, and the series could easily fill in some of those gaps.