Let me start off by saying, I am having a really hard time finding juicy threads this week and this morning, I am digging really deep, but still can't find good ones. It must be the holiday season...
Two posts, with no one backing them up, are reporting shifts in Yahoo! search results.
The first is an update to a WebmasterWorld thread, a post yesterday, post number 3201071. He says:
Beginning today, my referrals have soared... up about 8X... looks great for me!
The second post is from SEO Refugee from the day before, saying;
Something Happened At Y Yesterday for me it would seem because Y is suddenly very fond of one of my sites that it was previously ignoring up until yesterday... or maybe this is some sort of isolated flukey ... anyone else seeing some super-tremendous Y movements?
Honestly, I doubt this is a major update. Just some changes to some individual sites, IMO.
I'll keep looking for threads, but if I can't find, it will be a slow day...