Apocalyptica just posted on their Myspace Blog:

Hey there!
All Access Ozzfest Ticket Presale
Apocalyptica fans have access to a special ticket presale, with a choice of either regular event tickets or VIP packages which include exclusive seating, VIP parking, VIP lounge area with complimentary snacks & water, and access to Verizon Wireless Club:

http://www.ticketmaster.com/event/0C0040AEDA69830F?artistid=821241&majorcatid=10001&minorcatid=200

Password is OZZY (non case sensitive)

Apocalyptica has been confirmed to play the main stage at Ozzfest this year! This year, Ozzfest will be ONE DAY ONLY: August 9th @ Pizza Hut Park in Dallas, TX. Ozzy will obviously be there, and this year Metallica will make their Ozzfest debut! Other bands on the main stage this year include Serj Tankian (System of a Down), Hellyeah, Jonathan Davis (Korn), Cavalera Conspiracy, Shadows Fall and In This Moment. So if you’re anywhere near Texas, tickets go on sale Saturday, May 31…don’t miss it!