Panda 4.1 began rolling out last week and by now, it is fully rolled out.The previous official major Panda release was Panda 4.0 on May 20, 2014. Since then, Panda has continued to refresh fairly often on a monthly cycle and will continue to do that even with Panda 4.1. New chance for the unique content optimized websites, New penalty for the thin content optimized websites. Pierre explained Google added a "few more signals to help Panda identify thin quality content more precisely."