This is an interesting move from Sony.
They've shown an increased interest in obtaining publishing rights for new big third party IP, (this is the second signing of a AAA third party studio in the space of a month, the first being Jade Raymond's Haven studio in Montrea)l, but it also shows they're definitely targeting multiplayer games.
Firewalk Studios appears to be made up of industry vets- mostly senior Bungie developers with a smattering of COD, Halo and Mass Effect workers, but importantly the game they're working on has been in development for 2 years now, so we could actually see it showcased in the next year or so. Hiring's would seem to indicate that this is a AAA FPS game.