As of this post (2/29/12) – Google has announced they are doing a new Panda update today.
There are 40 New changes to their search and as for Panda, they were not really specific and only said “Panda update. This launch refreshes data in the Panda system, making it more accurate and more sensitive to recent changes on the web.”
Just remember that Panda does not like low quality or “thin” sites – which was the big commotion when Panda was first introduced and why many websites landed in the google sandbox.
You can read about ALL the search changes here.