Guerrilla Games has been working on the Killzone franchise for quite a number of years now, but some original IP could be on its way from the PlayStation developer. Over on the NeoGAF forums, there's leaked concept art for a new game called 'Horizon'.
Horizon looks like a very interesting mix of games, like a prehistoric science-fiction blend. We can see there are robotic dinosaurs, which is giving me flashbacks to the last Transformers movie, as well as some crossbow and gun action. There's not much known about it just now, but as news breaks on this game, we'll have it. It'll be interesting to see if this hits other platforms, or whether Sony will have Guerrilla Games making it a PS4 exclusive or not.