Webmasters are observing frequent changes and fluctuation of ranking in search result. Though there is no confirmation from Google it is supposed that an algorithm change is taking place in its search engine. In fact, webmasters are observing the changes in a pattern similar to Google updates or testing of a new algorithm. Rumours are spreading about the fluctuations in the SEO world now.
Webmasters are speculating that Google is testing Penguin update or making some other ranking algorithm changes in the search result. The test is being done with selected users and for a limited period of time. This is why ranking of a website is fluctuating irregularly like in other tests. Numerous tools like Mozcast, SERP metrics, RankRanger, Auccuranker, and others have reported warmer temperature.
2016 has just started and we have to wait and see to find out the major updates in SEO industry from Google. Webmasters are anxiously waiting for confirmation from Google.