Slipknot drummer Joey Jordison has revealed to Kerrang! that the follow-up to their 2004 effort 'Vol. 3: (The Subliminal Verses)' will be the heaviest of their 12-year career.

"It's going to be heavy as fuck!" smiles Jordison. "It's going to be heavier than 'Vol. 3...' but just as weird and as experimental. We have a whole bunch of song titles, but nothing I wanna say right now."

The sticksman - currently filling in for Korn drummer David Silveria, who has been on hiatus from the Bakersfield nu-metallers since the beginning of the year - will be touring with the band until October.

"I'm having a blast out on the road," says Jordison. "I'll be on the whole Family Values run in the US with Korn over the summer and we've got some Brazilian dates in August and September. The Korn guys are really laid back and the shows have been killer, but in October we'll be starting a new Slipknot chapter."

Jordison will regroup with his Slipknot bandmates to begin writing material for their fifth studio album with a view to recording in January.

"I've talked to the other guys a bunch of times over the last few months about the new album," he explains. "I've told them to demo whatever they can so we've got as much material to chose from as possible. So be warned 2008 is going to be all about Slipknot!"