We have seen way too many changes recently - not to call this a cumulative update and finally give it a name. I saw two big serps that are 100% different since last week- all top ten have changes - that's an update.
I am seeing old sites of mine that have been 301'd months ago showing up in the serps starting yesterday.
I also see the main site that these were 301'd to drop slightly so will have to wait till they are done stirring the pot to see what this thing will look like. It "appears", at least in my case that the 301's are not included in the sauce while they roll this out. That can make a huge difference to the final results.