April Fools today... The Google Webmaster channels on both Google+ and Twitter shared a April Fools Prank on Google Panda 5 and Google Panda 6 release.
It is a pretty comprehensive and detailed April Fools Prank which mocks the Apple product releases and at the same time mocks webmasters hit by the Panda algorithm. Even Matt Cutts helped out on this one, while on leave, to provide the answer to why Google used a Panda bear for this.
Watch the video, it won't make much sense, but that is the point: