Update: It appears that the teaser we posted about was actually related to a double valour weekend for Killzone Shadow Fall.
An in-game currency, Valor can be earned through online multiplayer matches and later used to purchase in-game rewards.
So not as exciting as we thought. Oh well, never mind.
Original: A new teaser suggests that the PS Vita version of Killzone could be getting an update, or maybe it'll even be a new game.
The following teaser was posted on twitter via the official Killzone twitter account and from what we can tell the graphics look very Vita-esq.
More news 'soon' we guess.