User blog comment:Omega natsu2/Chapter 370: Demons Reincarnated, Predictions./@comment-3075024-20140131185337/@comment-7418318-20140131192239

Renji didn't get a new blade. That was just the stupid "advertisment" text at the end of a chapter. He just unlocked the full (or at least further) potential of Zabimaru's Bankai.