There are some signs noticed recently that indicate a new Google Search Algorithm Update might be coming out shortly. Some of the forums have mentioned this fact and some, if not all, automated tracking tools have also started showing changes.
It is still too early to say anything about the update but the signs indicate that there is a possibility of the update coming up in a few days. You can keep an eye out in the next 24 hours to see if your rankings in the Google search have changed or not and if the traffic has registered any changes or not. Some people believe it is only in the UK. But as mentioned earlier, it is not yet time to comment anything in the matter.