Seems like news on upcoming Nerf Super Soaker models can be discovered a little earlier every year.
This year, found info and some pics on at least three (3) new 2019 Nerf Super Soaker models:
The Hydra appears to be an inverted Nerf Super Soaker SoakZooka while the Piranha is a trigger-based water blaster. No image is available for the Barracuda, but from its description, it has two stacked barrels that blast (continuously?) while pumping. Images and information obtained from Entertainment Earth.
More information on these water blasters as they become available.