Speaking at Eurogamer Expo, Guerrilla Games' Eric Boltjes has confirmed that the Killzone: Shadow Fall developer has begun work on a new IP.
"I can be true about it, yes. That's definitely what's happening right now. I can't tell you what we're thinking of but yes," he said.
"As a studio we do want to branch out, and we have started work on a new IP, something completely different to Killzone. I don't want to say anything about it right now, but as a studio we do want to keep it fresh."
Shadow Fall is a PlayStation 4 launch title and Guerrilla's artists have already started work on what will come next. The same process the studio applied in the months before Killzone 3's release when some of its staff were already at work on Shadow Fall.
"The artists and the coders work the longest, and then QA. But the designers, at some point their work is done. They're not allowed to touch the game because that changes everything for all other departments.
"So about three to four months before you ship, the designers sit down and think, what can we do for the next one.
"That happened then [with Killzone 3 to Shadow Fall] as well. So, about three years ago we went into that phase. The really tricky part about that phase is not trying to do too much. You have a room full of people and they all have a different idea of what they want to change about the game. They can't do everything, especially if you only have two-and-a-half years to build it.
"So it's streamlining that process of what we want to do to this is what we're actually going to do. That's the tricky part."
Boltjes would not divulge details of what the game will be but presumably it is a PlayStation 4 exclusive. All Sony first party studios are developing for PS4 with unannounced games from Naughty Dog and Sony Santa Monica on the way.
You can watch Boltjes' comments in the video below.