Players who boot up Splatoon 3 with some Splatoon 2 save data on-board their Switch will get a neat set of bonuses.
Splatoon 3 - Save Data Transfer Bonuses - SAMURAI GAMERS
Splatoon 2 Players Will Receive Bonuses in Splatoon 3 - Siliconera
Splatoon 3 QR codes (February 2023) – How to redeem and get free items - Dexerto
KoopaTV: Thoughts on Version 3.0.0 of Splatoon 3!
All Hero Mode Rewards and Unlocks
Splatnet 3 Guide - Splatoon 3 Guide - IGN
Just got the game, any major changes from splatoon 2 to 3 I should be aware of? : r/splatoon
Splatoon 3 Collectibles: Catalog Rewards
Splatoon 3's multiplayer save data will be stored server-side - Vooks