Killing Al Qaeda's "number three"
However, the announcement of his death comes from the Al Qaeda side, and the AP's treatment is that he's very credibly the real number three. So, we'll have to wait and see, but it could be important.
(By the way, I'm guessing he was killed as part of the Obama administration's response to the Times Square bombing attempt. If you'll remember, they hit every target they had in the days after that attempted attack.)