Sonisphere have just added sixteen more bands aswell as confirming that Antrax will do an extra set! the bands included are:

HIM
Comeback Kid
Sweet Savage
October File
Eureka Machines
The Bots
Straight Lines
Zico Chain
Black Dogs
Love Zombies
Stormzone
Shrine
Rival State
The Wild Lies
The Raven Age
Empire Kill

Scott Ian from Antrax explains about the second set:

“We love to play these songs and people love to hear them so we're really fucking excited to be doing this special show the day before our main-stage performance at Sonisphere Knebworth playing (for the first time ever) just the Among The Living record for you, our UK faithful!
It's gonna be sick. See you soon my friends. Cheers, Scott”

Sonisphere takes place at at Knebworth Park across the weekend of July 04 to 06. Tickets are available now from www.sonisphere.co.uk.