Google has announced a new Panda refresh, making this version 24 at 22 jan 2013.
This refresh has a noticeable impact 1.2% of English based queries according to Google.
The previous confirmed update was #23 and it impacted 1.3% of English queries on December 21, 2012. Prior to that was a refresh on November 21st that impacted 0.8% of queries. It seems like Google is now rolling out these updates every 4 weeks or so.
Last week there were significant reports of a Google update, which Google denied.