ProChara thinks that the Tacticooler special weapon in Splatoon 3 will likely be replaced in Splatoon 4 by the new Flow Aura mechanic that just got added to Splatoon 3.

I will use the same definition of Splatoon 4 that I used here: https://manifold.markets/SimonWestlake/what-year-will-splatoon-4-be-releas?r=U2ltb25XZXN0bGFrZQ

If there is a special weapon in the launch day version of Splatoon 4 named Tacticooler, this market will resolve YES, regardless of how its functionality differs from the Splatoon 3 version.