I believe theres going to be more Fillers before Sasuke & Itachi Vs Kabuto for reasons.
1. If Itachi ended the edo tensia, What other options will Studio Pierrot for making fillers , they need to make something that is relavents to the war arc
2. Zetsu is still lurking around as you seen Sasuke encountered Multiple White Zetsu after the Bijuu Showdown.
3. It's more likely that Studio Pierrot is more likely gonna add more screen time for the Edos such as Muu, Kimimaro, and Chiyo as the battle is getting heated up to the climax of the War Arc.
4. Studio Pierrot will always find the way to fit in the gap between the canon stories. Heck they can even completely change the storyline.
Like for example, we didn't get to see Mangetsu Who is Known to be the Strongest of the 7 Swordsmen. Studio Pierrot may likely let Kakashi and Gai entrusted Lee and Sai to finish the rest of the remaining Edos in their squad.
Same goes with the other rookies, they may still be fighting off Zetsu and or Edos.
Once they sealed all the enemies, the rookies 11 gathered up to aid Naruto in the main battlefield that leads to the canon/manga stories, I think that how its going to play out.
And Maybe they gonna add bit more fillers after Kabuto fights but it can't be alot of fillers I believe its gonna be 1-2 fillers cause as soon as Itachi ended the Edos, it should wear off quickly .