Its been in the game since 5.0 released so over a year and a half now. CN has a reworked Treasure system with the Seal Treasure offering different rare ninja and SR ninjas (I think Hokage Tsunade and Hokage Tobirama). Whether or not the Treasures actually get reworked, well.... If you want his fragments, Tailed Beast Attacks and Fragment refinement are still the only ways.