Google panda 4.1 rolling out is Penalize by low quality content of the website. So some website is very useful to Google panda update to reduce is ranking and other website for decreased the ranking.
Google said about that this update is rolling out slow down and begin earlier this weekend. 3 Percent to 5 Percent query is affected by this update.
This update is very useful to small business to working with Google Guidelines regarding SEO. So the ranking is approved by small business website and also increase website visibility in the Google.