The Anniversary Edition will come with 'all 48 currently available' creations in the Creation Club, as well as 26 that have yet to be released. First up, fishing isn't the only thing existing players of Skyrim Special Edition will get, with two of the Creation Club's paid mods joining it for free: Survival Mode (an optional difficulty modifier that adds hunger, fatigue, and cold mechanics, more diseases, plus limitations on fast travel, health regeneration, carry weight, and so on), and Saints & Seducers (a quest mod themed around the Shivering Isles, which also includes Rare Curios, a mod that brings back ingredients from Morrowind and Oblivion).
Bethesda have now given out some more info about both the Anniversary Edition and the fishing update, as well as its other plans for the RPG's birthday.