It seems to me that the filler will involve subject matter that the manga briefly touched upon.

Asuma's past.

In the previews for the next special that's coming up, they showed the 12 Ninja Guardians and their "past sins". I have no idea what that is, but it looks like I might actually enjoy this filler arc.

Also just keep thinking of the alternative to fillers....ten minutes of staring per episode, or breaks that last a multiple number of months like what happens in the States.