I'm calling Custom Dualie Squelchers. It's either that or the Clash Blaster Neo, and it seems logical for the Dualies to come first as it's been a while since an alt kit for one of those dropped. Also look at what weapons have dropped recently, most of them appeared in the footage showing off Rank X on the results screen and have turned up week after week (Sorella Brella, H3 Nozzlenose D etc.), and I believe all that's remaining are the Custom Dualies and the Clash. Neo Splash has 0 chance of showing up right now, as I've previously stated it's the last shooter weapon to release (one that has no gimmick anyway, Squeezer is branded a sub weapon style in the vein of Nozzlenoses and Blasters are Blasters) and they're going to want to hold onto that one, particularly so they can keep the "variety" of releases rather than end up going 3 weeks in a row of the same weapon class, plus they are fully aware of the carnage the vanilla Splash caused at the end of Splatoon 1 when people realised how many bomb rushes that thing could spam out so they won't be keen to start that disaster zone again (even though bomb rush won't fill the meter anymore and it has 200p special charge) :P.
Brellas won't appear since the Sorella was last week, Tri Nouveau is the last bucket to release so again, being held back like the Neo Splash, same goes for the Custom Hydra and Carbon. That narrows it down to a Blaster, Dualies or a Charger (Bamboozler Mk II and Custom Squiffer) which again feeds back to my theory of it being one of the 2 remaining teased weapons from the 3.0 and Rank X footage. Either one of those would be rather amusing considering the nature of the new Shifty Station and the fact you'd either get Sting Ray tethered or Tenta Missile tethered to a grappling hook so fun times there :P. Just my thoughts on the weapon release, of course Nintendo/Splatoon devs could decide to throw out a completely random weapon instead and prove me wrong. I'm really looking forward to the Tri Nouveau all things considered, it may have lost the chicken rush, but it gained a special I love dearly and the kit looks really solid, bombs and the chip damage off the special could give the Tri opportunities for "one hit kills".