I can't seem to find references to this anymore, but I seem to remember that the doom3 source code was stolen and released in like '03 or '04. So if that's true then my response to this article is, "Again?".
Oh yea. Anyone still has the old code? Would be interesting to make a diff between the alpha and this one. Not to see specific line-by-line fixes but more just to get a general impression of how feature complete it was back then.