These maps unfortunately still haven't been dated for release. On top of the free maps, developer Guerrilla Games is also working on Killzone: Shadow Fall's first expansion pack, about which the studio promises to share more info in the near future. This first expansion pack will be available as part of the game's Season Pass content.
Killzone: Shadow Fall, a PS4 launch title, resides on the border between good and great, our review said. The game's multiplayer side is punctuated by a make-your-own game type editor, with which both of these proposed maps are fully compatible.