After 2 INK-credible years of Splatoon 3, regular updates will come to a close. Don't worry! Splatoween, Frosty Fest, Spring Fest, and Summer Nights will continue with some returning themes!
Updates for weapon adjustments will be released as needed.
Big Run, Eggstra Work, and Monthly Challenges will continue for the time being.
Also they just released a video celebrating each splat-fest: https://www.youtube.com/watch?v=cd3qYJRnI7E
It's an iterative series, each game building on the predecessor's mechanics, so there's not any one major twist. But there are a lot of little things that add up. The new movement techniques are great, Salmon Run has been significantly expanded, and just in general the QoL is night and day.
Also, the fact that Ink Armor, Sting Ray, and Main Power Up are not in the game might be the true biggest step forward. S3's meta is in a pretty good spot now.