I'm not very verse of the Killzone lore, so is this a prequel or actually more of a Killzone 4?

For the first time in Killzone history, your player character finally got on the boxart instead of some random Helghast lol.

and the shooting button moved to the now trigger shaped R2

and I'm really excited about OWL. I've played KZ2 and it didn't really excite me, the ability to use the OWL as zipline to traversed the map made for varied approach to combat that I'm looking forward to.