According to Google’s Gary Illyes, the next Panda algorithm update should be coming in the next two to four weeks. This is more of a “data refresh” compared to a complete algorithm change.
Google updates its algorithms regularly to keep data fresh and to use the qualitative and quantitative data they have collected to continually improve the user’s experience.
Not much is known about exactly who or what will be affected until the update comes out but we will definitely let you the details as they become available.