Here's a couple of Dawn of War II - Retribution images which detail the collectors edition and and the compete collection which also includes Dawn of War II & Dawn of War II - Chaos Rising.

Also revealed were six race packs which include bonus war gear for each of the specific races in the game, these are only available in digital distribution versions but all six are included in the collectors edition.

It is ten years since the events of Chaos Rising and Sub-Sector Aurelia has been in a constant state of warfare with the Imperium struggling to retain control. The apparent betrayal of the chapter by Gabriel Angelos and his Space Marines has shaken the Blood Ravens and now the Imperial forces are beset on all sides by hostile aliens. Retribution allows the player to select the race of their choosing in a battle to determine the very survival or destruction of the entire sector. In addition to the multi race single player campaign, Dawn of War II - Retribution will also feature new multiplayer units, maps and the new playable Imperial Guard faction when it ships.