As well as the range of sets that will launch on August 1 to support The LEGO NINJAGO Movie, it seems that at least one LEGO Juniors offering – 10739 Shark Attack – will be available to provide a simpler build experience.
Brickset found this set on Amazon Japan, along with a description giving a hint or two about the movie’s villains
Great and White is attacking during the training at the base! Counterattack! Let’s practice the Lloyd’s practice and show the arm of the Lego® Ninja Go® Warrior! But to the flak missiles and harpoon guns of the Shark car. Take care of Kai on a motorbike on a flame and head for rescue. Save Ninjago City from Garuddon’s Shark Army.