A fresh press release just announced the first technical details of Killing Floor 2 on PlayStation 4 Pro. The game will run at 1800P (3200×1800) with checkerboard rendering, just like we surmised for many PlayStation 4 Pro games, and Ultra textures.
http://wccftech.com/killing-floor-2-on-playstation-4-pro-runs-at-1800p-with-checkerboard-rendering-ultra-textures/