Update 05/15/17: Eidos Montreal studio lead David Anfossi has tweeted regarding this news, suggesting that the developer is not working on a new Thief game: “Apparently we’re developing Thief 5 game! So now we have a title… We just have to build a team,a budget… Forget it!”
Original 05/11/16 at 5:59 p.m.: A fifth Thief game is currently in development alongside a film adaptation planned to launch in step with the game, according to film creator Straight Up Films.
The Thief film will be set in the steam-punk world created by the video game and tell a new chapter in the “storied world” of the series’ protagonist. It is written by Adam Mason and Simon Boyes, produced by Marisa Polvino, Kate Cohen, and Roy Lee, and executive produced by Sandra Condito.
Straight Up Films’ official film project page mentions the new game being in development. When asked if Square Enix could confirm a fifth Thief game is in development as per the project page’s claim, a company representative told us, “We don’t have anything to announce at this time.”
The fourth entry in the Thief series, a reboot simply titled Thief, launched for PlayStation 4, Xbox One, PlayStation 3, Xbox 360, and PC in February 2014.
Thanks, Game Informer.