A report is suggesting that a planned third game in the Deus Ex trilogy has been put on hold.
Eurogamer is reporting that Square Enix has drastically cut development on the Deus Ex franchise, going so far as to put a planned third title in the Human Revolution trilogy on hiatus for "the foreseeable future". The move is reportedly due to a shift in focus to its recently-announced multi-game Marvel project, combined with underwhelming sales of last year's Mankind Divided.
Fans of the series will know that Mankind Divided left a lot of questions unanswered, and a lot of story threads untied. Reportedly, Mankind Divided was set to answer all of those questions, but at some point in development content was cut to be saved for a third game, which has now been shelved. It's unknown if fans will ever see the resolution to the series they are waiting for.
When asked for comment, Square Enix responded that "While we are still working on expanding the Deus Ex Universe, along with creating new content and updates for Deus Ex: Mankind Divided, we're also devoting our talents towards working with Crystal Dynamics and Marvel on The Avengers project."
The DLC released thus for for Mankind Divided focuses on single, stand-alone stories, rather than a continuation (or conclusion) of the main story plot.
So while the possibility hasn't been completely ruled out, don't expect another Deus Ex game any time soon.