there was a recent interview with kishimoto and the director/producer of the anime. they said they planned on about another 2 months of filler so they manga was adequetely ahead of tehe anime. they also said that due to the speed of the anime, these 'filler saga' will probably become a regular thing, about every 6 months or so.

im too lazy to post the link, so u can just google it. keyword, kishimoto/naruto interview/ naruto filler update