A collection of the three main games in the Killzone series have been listed on French Amazon (via The Sixth Axis). Nothing has been confirmed by Sony, but according to the listing the game is coming out October 24 and will cost €59.99.
The first game in the series was released on Playstation 2, but was previously meant to come out as a HD port on PSN. Perhaps, this is a repositioning of that proposition? Oh well, it could also be absolutely nothing so we'll have to wait and see on this one.