There is a single report at a WebmasterWorld thread of a possible Yahoo Search update. Senior member, textex, is noticing changes in the Yahoo Search results, but clearly, the Yahoo Search Blog has not posted anything since December 15th.
Typically, when it comes to Yahoo Search updates - we normally see it being reported in the forums before Yahoo posts anything on their blog about it. Also, we typically see Yahoo Search update every quarter or so and the last update was in September 2009, so we are do an update.
Do you notice any ranking changes in Yahoo or a shift in your Yahoo referrals?
Note: As Yahoo loses market share, less and less webmasters and SEOs are concerned about Yahoo. So it doesn't surprise me to see such little activity in the thread at this point. I do hope the thread picks up.
Forum discussion at WebmasterWorld.