On June 2, 2014 USPTO concluded its transition to the Cooperative Patent Classification (CPC) system. Even though we knew it was coming, things have been a little more complex as we are transitioning all of our year-to-date So Far analytics to map to the new system. We're getting there and should be publishing our digests soon.
One of the things we've assembled over the last year or so has been our own cheat sheet on how the new classification system works and how to figure out all the new patent-speak that goes with the new classification system. (We now appropriate classification symbols instead of classifying stuff.)
There are lots and lots of pages of information on how the system works on both the USPTO and EPO websites. The primer is designed as a quick start before you take the deep dive of trying to find things on your own or get a deeper understanding of how this new system works. Let us know what you think at info@waybetterpatents.com -- and let us know how you are doing finding patents using this new system.