As I noted in the June 2011 Google report, there is some early indication that Google is doing a new Panda release now.
A WebmasterWorld thread has people taking notice of the ranking changes as of last night after 6pm EDT.
Here are some of the comments:
Some history on Panda. Panda was released in February then Panda 2.0, the international rollout, hit in April and then Panda 2.1 was rolled out in May. So June is a nice time for Panda 2.2 or 3.0 – did you notice any changes? Will this result in sites finally recovering from Panda?
Our ongoing coverage and stories on the Content Farmer/Panda update:
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Forum discussion at WebmasterWorld.