One of the biggest announcements was the fact that the band SashiMori returns to Splatoon 3! This band debuted in Splatoon 2!
Big Run is also getting bigger with Big Big Run (hopefully that's not the name), where you might be able to face the Triumvirate.
Only one map this season, very disappointing. It's called Lemuria Hub and it seems to resemble a train station.
Finally, you might want to know that we are FINALLY getting a new Stringer (called the Wellstring V) and a new Splatana (called the Mint Decavitator).