Dynamo Rollers

Dynamo Roller: When flinging ink, the central zone in which an opponent can be splat, is decreasing by 18%.  

Gold Dynamo Roller: When players attack the Rainmaker’s Shield in Ranked mode, damage is increasing by 12%.  

Tempered Dynamo Roller: Ink recovery time after a fling attack is increasing from 1. 17 to 1. 33 seconds.  

For the Dynamo Roller and Tempered Roller, these will be considerable nerfs. 

[Source]

Special Weapon Effects:

Bubbler: Without any gear buffs, the base duration of the special will decrease from 5. 0 to 4. 5 seconds. Furthermore, the maximum duration buff from gear abilities will increase from 40% to 60%.

Kraken: The base duration of the special will decrease from 6. 0 seconds to 5. 0 seconds. Additionally, maximum duration from added gear buffs is increasing from 40% to 60%.  

The Kraken has been nerfed in previous updates, and it is unclear if this will be the final nerf. 

[Source]

The latest Splatoon update promises to balance gameplay experience. It is unclear, however, how many further updates the game will receive, considering the recent announcement of the very last Splatfest.