Well Bethesda soft works will be doing fo4, and Obsidian did this game. Im not sure how much of Bethesda soft works resources go into an Obsidian made dlc if any, but it can t be much.
I don t think it will hold fo4 up. Fo4 is a long ways away anyhow.
Hopefully not too long. Bethesda started pre-production on Fallout 3 in the months before Oblivion was released. Now we're in the months before Skyrim is released, I'm hoping they're in the preliminary stages of Fallout 4. I tentatively hope for a 2013 release.
Oops, apologies for going off-topic. :spotted owl: