From Blabbermouth:
"As announced last week, thrash legends ANTHRAX regretfully cancelled the first three dates on the second leg of their European tour due to new vocalist DAN NELSON's unexpected illness. An additional seven European dates are also cancelled, those scheduled from July 22 to July 30.
"Anthrax is thrilled to announce that they will play the August 1 Sonisphere festival in Knebworth, England, with their good friend JOHN BUSH [Anthrax's singer from 1992 to 2005] joining them for a very special one-off performance.
"The members of Anthrax have confirmed the departure of vocalist DAN NELSON. In light of this development, Anthrax's slot on the U.S. SLIPKNOT dates set for August and September, has also been cancelled. Anthrax is already actively considering lead singer candidates, and looks forward to hitting the road before the end of the year."
This must be pretty serious if it gets them to forfeit an opening spot for Slipknot. Personally, I think John Bush's full-time return would be amazing–he's a much better singer than Joey Belladonna and We've Come For You All was as strong an ass-kicking as any of their classic albums. After the way he was dumped by the band to make way for the Joey reunion, I wouldn't blame Bush for staying away, but having him back would probably be the best move for Anthrax right now.
-Ben