Recently, I have been hearing a lot of chatter on Search Engine Optimization sites and with Bay Area Web Developers regarding a proposed Google overhaul to its search algorithm. Google has gone ahead and said that an overhaul was due for the algorithm but this is NOT a change specifically to the Panda algorithm. What's more, Google has said to expect more changes to SEO practices as they keep tweaking the secret sauce and improving search quality.
Google had this to say:
"This isn't a change to the Panda algorithm. We are constantly making improvements to the search engine algorithms and the web is also constantly changing. We’re going to continue to build on improvements across our brand to deliver the best user experience ... "
This mirrors another statement Google made regarding the Google Quality Update, so don't be shocked if what we are actually seeing is changes made from May 1st of this year and not an update to Panda.
The intriguing part is that a number of online tracking services, such as Mozcast, have seen some wild flucations in Google query items. One theory is that HTTPS calculations had come into play and sites with HTTPS are being given more weight, however Google has gone on record and said that this was not the situation. My personal opinion is that we are seeing weird spikes because of Wikipedia changing all its URLs from HTTP to HTTPS security standard, which changed a large number of 1-5 Google list items, bringing about the changes we have seen.
So to sum it up, this is not Panda change, not HTTPS weighting and also not Penguin Update. Just a normal everyday fiddling with the black box of Search Engine Optimization which of course Google is going to keep close to the vest.