According to Corey Taylor, the only things that halted the Anthrax collaboration were management and record label reps, who wanted a new Slipknot album.
Sevendust are currently in the studio working on their next record, which is to be released in April of next year. They have been posting daily videos of themselves recording the album. On this video, they invited Anthrax frontman Joey Belladonna to listen to a new song called 'Blackout'.