"Big Run is imminent!" On the cosmic scale, perhaps.
Splatoon's second season starts as soon as possible in December.
The "Chill Season" will open on December 1 (time TBD) and will feature new stages and weapons in addition to modes. The trailer shows multiple new weapon variations including a new set of Dualies, a Tentatek Splattershot, and a sniper rifle with a visible bullet chamber.
The end of the video also promises "Big Run is imminent": Big Run is a version of Salmon Run that takes place on standard stages that was announced in the Splatoon 3-dedicated direct.