THE ZANPAKUTOU ARC IS ENDINGGGGGGG!!!! *clap clap*
According to Bleachexile.com we have about 5 (or more) filler episodes left before coming back to the Arrancar arc.
These episodes are:
251 - "Dark History! The Worst Shinigami is Born"
252 - "Byakuya, the Truth Behind his Betrayal"
253 - "Muramasa's True Identity Revealed"
254 - "Byakuya and Renji, the 6th Division Returns"
255 - "Final Chapter·Zanpakutō Unknown Tales".
So, Yay! for those people who can't wait to go back to the main story arc in Hueco Mundo XD Wheeeeee~!!