I noticed some major changes in the Google search results several weeks ago and wrote this article.
I noticed these changes start to take affect 3-31-15.
http://gototom2.blogspot.com/2015/03/google-newest-search-results-are.html
Now this is confirmed via SearchEngineLand's contacts with Google.
http://searchengineland.com/the-quality-update-google-confirms-changing-how-quality-is-assessed-resulting-in-rankings-shake-up-221118
Now people are calling this Google update the "Quality Update"
I think this is a good name for it.