https://www.gamespot.com/articles/new-splinter-cell-game-possibly-hinted-at-in-sam-f/1100-6458140/

It's been nearly five years since the release of the last Splinter Cell game, 2013's Blacklist. That's part of what makes the sudden return of Sam Fisher in Ghost Recon Wildlands--as part of a broader Splinter Cell-themed update--so exciting. And while it's just nice to see Fisher back and Michael Ironside providing his voice, the update may hint at something more.