reseller - 12:45 pm on Feb 1, 2012 (gmt 0)
Google did confirm a Panda refresh (recalculation of all site's quality) about a week ago.
I wss talking about "Panda update". The Panda data refresh your refer to isn't considered as a Panda update, IMO.
@tedster put it in a very nice way :-)
It seems to me that the machine learning part of Panda is used to establish what factors are used in the algorithm. If those factors change (or possibly even change their relative weight) that would be an UPDATE. But in this case, the actual factors didn't change - just the data about websites that is being measured, as rustybrick explained.