A rumored Ubisoft roadmap has appeared on social media apparently revealing some game release dates, schedules, and IP details. It seems both Far Cry 6 and Skull & Bones could be arriving sooner than expected, while Avatar joins a new Assassin's Creed game in 2022. The most believable aspect is that Splinter Cell is still being swept under the carpet.
https://www.notebookcheck.net/Dubious-Ubisoft-roadmap-lists-Far-Cry-6-and-Skull-Bones-as-coming-soon-with-Avatar-scheduled-for-2022-but-still-no-sign-of-Splinter-Cell-sequel.532932.0.html
So, in this new IP, humans have to go back in time to stop something from ending the human race? Game over...if there are humans alive to go back in time, then their race wasn't ended and they accomplished the mission.