This site claims so. But with a quick google search it becomes apparent that they jumped the gun quite a bit in saying that. They did not include the full quote:
A Thursday Reuters report said Fallout 3 executive producer Todd Howard believes three or four years is a good span of time between sequels.
Great. So Fallout 4’s coming in 2011, right?
“I’d call that jumping to conclusions, and then some,” said Bethesda PR man Pete Hines in an e-mail to Edge.
In the report, Howard did say that he believed that the 10 years between Fallout 2 and Fallout 3 was “a bit long,” however.
To that, Hines said, “An accurate headline would probably be, ‘Fallout 4 before 2018,’ since that’s what he really said (10 years is too long).”
So basically we know nothing more then Fallout 3 is out on Tuesday and that they are planning on making a Fallout 4 and releasing it sooner then ten years from now… slow news day?