Playstation has announced the Killzone Collection today and even released a trailer for it.
The Trilogy will of course include all 3 Killzone games {Killzone, Killzone 2, Killzone 3). Killzone 1 will be featuring a full 720p HD makeover and full trophy support.
The bonuses you get with 2 and 3 are map packs for multiplayer.
Killzone 2 Map Packs:
Steel & Titanium Map Pack
Flash & Thunder Map Pack
Napalm & Cordite Map Pack
Killzone 3 Map Packs:
Steel Rain Map Pack
Retro Map Pack
From the Ashes Map Pack
The Trilogy will be for sale come October, 23rd, 2012 for only $39.99 USD (24th for our Euro friends with a price of €49.99/£40.84 sorry 
if its any compensation it seems you guys get the cool case. )
