this is a superb addition, adding 2 new races necrons who are slow but very tough and tau who have massiv firepower
it doesnt need the first 2 games to run but without codes from the back of their manuels you will miss out on a lot of races
new units for every race such as a harlequin for the eldar and updated graphics so exarchs really do look like the new exarchs !
but the huge bonus is the free flowing campaign, which is map based and your leader gets extra gear to choose from and its a lot about 12 -20 items depending on race for the eldar ourt leader is a farseer and gets things that enhance psychic powers like a ghost helm and armour and shruiken pistol and a neat double pistol as well a witchblade and singing spear and these alter the ingame graphics! B)
you also get bonuses from certain areas held which can be strategic skills like to be able to attack 2 a turn or attack any province on the map or the option to train units as an honur guard who appear with your character at the start of a battle giving you an edge
have played the camp with eldar and necrons so far and havent got that far yet but its well worht the money if you liked dawn of war

yeah, i would have bought that game the day it came out if it wasn't for 2 things: 1) I have exams and if i buy it before my exams i will fail them 2) I need a better graphics card

very wise Never buy a game before exams lol