European Switch users have gotten a news item about amiibo, which, as Nintendaan points out, notes that amiibo will be compatible with Splatoon 2. The tweet is below:
— Daan Koopman (@NintenDaan) March 21, 2017
Since amiibo were compatible with the original Splatoon, it seemed reasonable for them to return in the sequel, though we don’t know how they’ll be used. Splatoon fans will probably want to keep their Inklings on hand.