Assassin's Creed Shadows doesn't totally tie up every loose end it introduces, but don't worry too much about lacking closure. One of the open-world game's lead developers has explained that the RPG's new Animus Hub will serve as a connective tissue between Shadows and whatever the future of the series holds.
To quickly catch you up, the Animus Hub basically functioned as a menu in Assassin's Creed Shadows that gave players a short synopsis of some previous AC games and let players launch them directly from the Hub. It also contained sections dedicated to Projects (basically battle passes), the Exchange (an in-game shop), and most interestingly, the Vault (a catch-up of the ongoing modern day storyline.)
