Sadly nobody knows when the fillers will end. The sad fact about all this is that fillers would no longer be needed with how far the manga is ahead, it's almost laughable.
Wasn't it supposed to be the sixth? I don't mind fillers, but it's getting ridiculous now. We won't even get to see BM at this rate, even though it was showcased in the opening. :\
Seems like a lot of people are saying around end june-early july. June 27, 2013- the latest known episode looks to be filler. Death to fillers. I say we riot.