Right, I saw that, but I read the article (thanks to jkush's submission) on the 8th, and the article's date is May 10. Anyways, it's not important, just a pointless observation.
I would guess it's the date that will be printed on newsstand issues. I noticed some time ago that a lot of magazines post-date themselves, presumably because people are less likely to buy a magazine that's dated a week ago.
