Ru Weerasuriya from Ready at Dawn Studios confirmed this in an interview with Play3.
“Currently we do not aim [for] 60 frames per second. In a first person shooter that [surely] makes sense. Also fighting games are undoubtedly predestined for 60 frames. But for us, the cinematic experience is in the foreground – presented in full HD 1080p speak. In favor of spectacular effects and the highest resolution we restrict ourselves to a liquid 30 frames per second,” he said.
http://gamingbolt.com/the-order-1886-will-run-at-30fps-and-1080p-on-the-ps4