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As I understood it, Interplay did sell some of the rights to Fallout, but kept enough to work on developing a MMO. They claim that to help fund the Fallout MMO, they intend to work on little side-projects to gather the money. One of the games they indicated was a D4.
Furthermore, I have found enough sites confirming this, that it seems clear to me that this little story is more than a mere rumor. But of course, only time will tell.
Furthermore, I have found enough sites confirming this, that it seems clear to me that this little story is more than a mere rumor. But of course, only time will tell.

"You just struck out for the next five innings" "But it didn't get me!" -Calvin & Hobbes