According to the official patch notes from Nintendo Everything, the update focused on three primary areas:
If you have a specific question about Assassin's Creed III Remastered or its updates, I'd be happy to try and help. Assassin-Creed-III-Remastered-NSP-Update-1.02-R...
Resolved missing challenge notifications during the first sequence of the game. Community & Critical Reception According to the official patch notes from Nintendo
This update focuses heavily on technical refinement and quality-of-life improvements specifically tailored for the Switch's hardware. Assassin-Creed-III-Remastered-NSP-Update-1.02-R...
Experience the American Revolution like never before. This package includes the base game Assassin’s Creed III Remastered in NSP format, pre-patched or bundled with the 1.02 Update .NSP (Switch) Included Content: Assassin’s Creed Liberation Remastered and all original solo DLC (The Tyranny of King Washington). Improvements: