Tomorrow, January 25, after months of speculation, Mayhem Fest will announce the lineup for this Summer’s tour. However, thanks to a slip of the tongue comment, we won’t have to wait to find out at least one of the festival’s headliners. And if you’ve been following all the rumors leading up to now, then you won’t be surprised to find out that it’s Slipknot.

During this past weekend’s NAMM show in Anaheim, CA, Ibanez Guitar representative Russ Rosenfeld was showing off the company’s artist lines of guitars to Guitar World. While showing off Slipknot guitarist Mick Thomson’s signature line, Rosenfeld let it slip that the band would be headlining Mayhem Fest this year. You can watch video of Rosenfeld revealing the news, as well as showing off Thomson’s signature guitar models, above.

But as we said, out of the bands that have been rumored up to now, Slipknot’s involvement quickly became a sure thing. Though originally it seemed that they’d be doing their own tour in the U.S. this Summer, the band started dropping clues and playing the “can’t confirm nor deny” game in regards to Mayhem Fest. While they’ve headlined the touring festival’s inaugural year, this is still a major grab for Mayhem since it’ll be the first time Slipknot have performed in the U.S. since the passing of bassist Paul Gray. And if the other bands rumored for this year’s lineup turn out to be true, then this will be one hell of a package.