He did not specify how much this impacted the search results but based on my analysis of the SEO community, it had a very small impact on most SEOs.
This would be the third update to the page layout algorithm. Since it is just a refresh, it doesn't mean Google updated the algorithm, but rather reran the algorithm and updated it's index. So I doubt Google would classify it version 3.0, but rather 1.2 maybe.
Previous Updates For Google's Page Layout Algorithm Was:
- Google Page Layout Algorithm Launch on January 19, 2012
- Google Page Layout Algorithm Second Update on October 9, 2012
- February 6, 2014, the third update
Here is Matt's tweet:
SEO folks: we recently launched a refresh of this algorithm: http://t.co/KKSXm8FqZW Visible to outside world on ~Feb. 6th.— Matt Cutts (@mattcutts) February 10, 2014
What does it look like when a site gets hit by this? Here is a screen shot from WebmasterWorld of someone who was hit:
Again, very few seem to have been impacted by it but there are some and they are complaining in the forum threads I link to below.