The Slipknot camp seems to be sporting more change than a two-bit gumball machine in the months leading up to the release of their second album.

The masked makers of musical mayhem have cancelled a string of concert dates announced earlier this month, according to a Roadrunner Records spokesperson. The five-city trek was scheduled to begin May 4 in Cedar Rapids, Iowa. No reason has been given for the change of plans, and it's unknown whether the gigs will be rescheduled.

Now, instead of performing in Green Bay, Wisconsin, on May 7, Slipknot will invade Minneapolis — not Los Angeles as was previously planned — to film and record their musical contribution to the remake of the '70s film "Rollerball," which is scheduled to hit theaters August 17. It's still not known what the song is or whether it will appear on the movie's soundtrack.

The as-yet-untitled follow-up LP to 1999's eponymous disc also has a slightly modified release date: July 17, according to the spokesperson. That's a week earlier than what maggots, a.k.a. Slipknot fans, have been waiting anxiously for — at least since the last due date modification.

A few commitments, though, are still firm. The band is on course to head overseas on May 17 for a series of headlining shows and European festivals, and a main-stage slot on Ozzfest kicks off June 8 in Chicago.

(For a full-length interview, check out "Slipknot: Unmasked".)