I'm especially interested in the "BigBall_Launcher" series, mostly because they're the only weapons who don't have official names that we know of but also because of the potential concept. They might work as a cross between a Slosher and a Blaster, throwing huge balls of ink that explode after a set period of time. I bet when they're released it'll be under the name of "Blast Slosher" and "(Alt) Blast Slosher".
Also, Carbon Roller Deco's Seeker Rush is going to be a pretty harrowing special to go up against though hopefully one that has weaknesses to exploit. As for the Mini Splatling, it might be weaker than the Heavy version but I'm hoping the quicker windup and sub/special combo make up for that.