User blog comment:TVthePunisher/Bleach Episode 287...start of a new filler arc?/@comment-1248963-20100818020630

I believe it will be something like the Karakura-riser or when Rurichiyo reappeared for two episodes, a mini-filler to finish the "arc". If my calculations are correct, this may go for three episodes, and then we'll have a new opening and ending, but will continue along with the normal manga line. It's too soon to introduce a whole filler arc, it'd totally kill the fandom.

Though I admit that when I read the manga I thought this was the perfect place to introduce a filler arc (it's the pattern, you know, make filler when you have Ichigo flying towards something), but this is too soon considering how fast the anime is taking things.

I'd say the perfect place for a filler would be the point in which Aizen leaves for RKT, though knowing the studio guys, I doubt they'll go that far.