
The full line up now looks something like:
Metallica * Slayer * Megadeth * Anthrax * Arch Enemy * Biffy Clyro * Slipknot * Airbourne * All Time Low * Arch Enemy * Architects * Diamond Head * Fozzy * Gallows * Gojira * Grinspoon * House Of Pain * In Flames * INME * Kids In Glass Houses * Limp Bizkit * Mastodon * Motörhead * One Minute Silence * Parkway Drive * Periphery * Protest The Hero * Sum 41 * The Sisters Of Mercy * Volbeat * Weezer * You Me At Six
More info on this year's Sonisphere festival can be found on the official site, and here's the link for tickets.