Learned about the upcoming Nerf Super Soaker HoverFlood device on this German website. This does not appear to be a water blaster, per se, but rather a type of sprinkler that, with adequate hose pressure, will cause the blades to spin and the upper sprinkler-section to rise into the air, held aloft by its spinning blade. Could be fun, but how well it actually works remains to be tested.
The Beauty of Water Blasters, Water Fights, and More