Slipknot plans on releasing a 4th Studio Album in 2008. It will be their first studio release since Volume 3: The Subliminal Verses.
Vol. 3 saw the band experimenting with acoustics, guitar solos, thrash metal riffing, and no swearing. The band has stated that they would like to continue all of these (but will include swearing), in addition to their original nu metal sound.