Gears of War Studio Reportedly Working on New Killzone for Sony

People Can Fly, co-developer of Gears of War: E-Day, is reportedly teaming with Guerrilla Games on a new Killzone project codenamed Delta — though nothing's official yet.

Here's a rumor that'll make your head spin: the studio that helped build Gears of War might be quietly working on a PlayStation classic.

Gears of War: E-Day is out now, co-developed by The Coalition and People Can Fly, and published by Xbox Game Studios. But it looks like People Can Fly might have a second dance card — and it's with Sony.

According to a report from MP1st, Guerrilla Games is working with People Can Fly on a brand-new Killzone project. Before you get too excited, though: the game is reportedly in extremely early development, so don't expect an official reveal anytime soon.

Here's the interesting wrinkle — Guerrilla isn't handling this one solo. The project is said to use an external co-development model, and plenty of clues point to the Polish studio People Can Fly, the same team that worked on E-Day. Yes, the studio that just shipped an Xbox flagship could be lending a hand to a PlayStation icon.

The report claims People Can Fly actually signed with Sony back in March 2025 to co-develop a new entry in an existing IP, known internally by the codename "Delta." That's the piece of the puzzle that lines up with the Killzone chatter. Worth stressing, though: none of this has been officially confirmed by Sony, Guerrilla, or People Can Fly.

So what does this mean for you? If the rumor holds up, it would mark a big return for Killzone, a franchise that's been dormant for years while Guerrilla focused on Horizon. It would also be a fascinating cross-platform story — one studio splitting its time between Xbox's biggest shooter and one of PlayStation's most storied sci-fi series.

For now, treat it as exactly what it is: an unverified report about a project in its earliest days. No release window, no platforms, no official word. Just a very intriguing breadcrumb.

What do you think — is a new Killzone the comeback PlayStation needs, or should Guerrilla stick with Horizon? Drop your take in the comments.