whatswithjeff.com: "Naruto 668 is the next exciting chapter in Naruto Shippuden manga series to be released by the second week of March. Naruto and Sasuke are both safe now and they are on their way to recovery. Kabuto arrived to help Sasuke, just as many of us predicted, and Obito was able to start transferring the Kyubi’s chakra back to Nartuo. But the main thing that will happen in Naruto 668 is that Gai is determined to use the 8th Gate and will turn into Konoha’s “Red Beast”. Will this finally be goodbye for Mighty Gai? Will Naruto turn into Rikudou Naruto as well? Will Sasuke have Rinnegan activated? And what is Tenten planning to do with the Treasured Tools of the SOSP, Kohaku no Johei and Benihisago? Let’s find out in Naruto chapter 668."
Really need to avoid using spoilers in titles. This probably will not happen for another 2 or more years in the anime.