next week is not a filler. Surely, it's extended, but have you not read the manga? this is all about guy acknowledging kisame. in the trailer they even show the previous seven swordsman and the fourth mizukage for crying out loud!
I swear to god Bee and Guy have me rolling there soo funny. but ive waited for this episode since naruto left on the ship to see naruto's speed and guy's inner gates and i wish they made it more incredible/powerful