Some brief, but interesting notes to be found on the GameStop product page for the Anniversary Edition:
https://www.gamestop.com/video-games.../11097922.html
-New in March to October: Strategically make your push for the postseason with expanded Front Office moves, updated Player Development, and a more flexible in-game experience
-New in Road to The Show: Updated paths to the pros and expanded reward opportunities
-Improved defensive and hitting mechanics
-Expanded customization across the board
-Stay tuned for detailed updates and new feature announcements
The notes include no mention of Franchise Mode...but I guess that could be part of the "future announcements".