Uhm people, gamescom is in germany. Fallout 3 was released in germany in a low violence version, international version is on index. Doom 3 was published, while the addon is on the index. (not sure if index is a international thing, in germany it's the list of games that are not allowed to be sold or advertised openly)
Thinking about the violence of the first Doom gameplay i can't see this being shown at all. As a german i expected this. It has nothing to do with Bethesda or something wierd going on, it's just our local thing towards violence.