I said to expect those (roughly monthly) updates to become more of a daily thing. That data refresh became more frequent (roughly daily instead of every 3-4 weeks or so) well over a month ago. My best guess is that any changes people are seeing are because that particular data is being refreshed more frequently.
Some people have been asking for more info about possible reasons for ranking changes. I wish I had time to give site-specific advice to every webmaster, but I’m sorry to say that I can’t. But this morning I took an hour or two and looked at 4-5 sites where people were asking about changes in ranking for their sites. I wrote up my comments and advice for those sites, which sits in a huge comment right here.
If you’ve seen ranking changes for your site recently, I hope that some of the feedback on those sites will be more widely helpful and give a few areas for people to check out on their sites.