https://www.ea.com/games/apex-legends/news/evolution-collection-event
^^ full patch notes, unfortunately only Sheila changes and no tactical or passive changes.
Check out "Season 12 & Anniversary reward details!" on Companion for Apex Legends. Download the app at https://play.google.com/store/apps/details?id=com.apex.legendscompanion
Pretty good app to get updates, but that's what where the info is at.