The assets in question are several light textures and one water texture, and the similarities are so extreme that the files even bear the same names—albeit not the same extensions—as their brethren from Doom 3 and Half-Life 2. Neither GSG nor THQ have responded to the allegations yet, but id Software CEO Todd Hollenshead told Shacknews the following:
I've seen a post on a web forum that claims DOOM3 assets are used in another game, but we've been working hard on Enemy Territory: Quake Wars as well as our own internal project and have not had the time to fully investigate or otherwise verify that the claim is true. Only from what I've seen on the Web, it's concerning. However, it may turn out to be nothing. Nevertheless, it would be improper to make any decision about a course of action until we find out whether the claim is true, and what assets from DOOM3, if any, have potentially been used.Shacknews says it guesses (and hopes) that the assets are placeholders not actually used in the game. That wouldn't be surprising: early S.T.A.L.K.E.R. videos used sound effects from Counter-Strike, but those were removed from the final release. Nonetheless, neither id nor Valve are bound to be very happy about this, and the situation might not end well for the Ukrainian start-up.