There not saying the NEXT 22 episodes will be filler but there most definatly will be a Filler arc after the conclusion of this one. The next arc isn't finished yet in the Manga and as such there is no way for them to immediately start animating that after this one. Essentially same as Naruto they need to just do a season while the manga has some time to skip ahead. Virtually every long series either does this or we could have DBZ's 6 episode 1 on 1 fights if you prefer.