The "bulk" of Guerrilla Games' staff are hard at work on a fourth instalment of PS3 FPS series Killzone, Edge reports.
Speaking in the mag's latest issue - which is with subscribers now - studio recruiter Adrian Smith stated that Guerilla has "got to continue the Killzone franchise."
Alongside Killzone the studio's also working on a new IP, Edge reports, led by former Killzone game director Mathijs de Jonge.
"An embryonic new IP is growing within the studio for the first time in seven years," the mag writes. "Additional staff cycle in from the Killzone team for brief stints to lend their expertise."
Smith added: "We're at 160 heads now; we're looking to get to about 190 to 200 within 12 months. That may or may not happen because of our benchmark."
In another report Edge claimed the next-generation of consoles could arrive as early as next year. Could Guerrilla be prepping Killzone 4 as a PlayStation 4 launch title?