Actually, you could just run away with the Kraken. Its mobility is unparallelled and it's invincible, so it's much better used for defense and escaping than attacking (except maybe ambushes). Also, I think you come out of the Kraken at full health, so you could get close with it and splash ink around as you return to kid form (not sure that would work, but maybe). I'm actually more worried about the Slosher Deco's sub, personally; Splash Wall doesn't seem that good on the Slosher, since it's a shortish-range weapon and best for firing over cover, so I don't see the point of giving that a wall to hide behind. Maybe it's for team-support, like the Inkbrush Nouveau's Bubbler?
But I dunno.
I'm more curious about the Mini Splatling. Will you be able to walk faster with it? Will it not fire as long? Will it have less range? Will it fire faster? Will it be weaker?
And also the Hydra Splatling. Is it more of an E-Liter-y Splatling, with amazing range but a longer charge time, or will it be something else? Because that's what it looks like to me, but I can't be sure.