There are so many webmasters not noticed about this update because this roll out is very slow. Google says the "update can take months to fully roll out". That means Panda algorithm is still site-wide, some of your Web pages might not see a change immediately.
In September 25, 2014 we had an official Panda update Panda 4.1& that was the 28th update since we saw small fluctuations in October 2014.As far as I know, very few webmasters noticed a Google update this weekend. That is how it should be, since this Panda refresh is rolling out very slowly.
Google said this affected about 2%–3% of English language queries.