In case you haven’t heard, the Panda 4.0 update went live earlier this week. It is possible that you didn’t notice any volatility in your rankings or traffic; Matt Cutts suggested that this update will be gentler than previous updates and should lay the groundwork for softer updates in the future.
So, an update hit, but what does that mean for you? If you are following best practices and focusing on your users and audience, probably nothing. Panda has cut a swath through low quality, spammy content and helped prop up quality content creators. Google has continuously said that if you focus on content and your users, you have nothing to worry about.
That being said, it is worth checking your rankings and traffic over the next week or two just to make sure that you are panda free! Sometimes the rankings and traffic take a while to settle down after an update like this, so it is possible that you will see some fluctuations after an update gets published. Don’t be too frightened though, this “shuffle” normally corrects itself after a week or two.