According to Ozzfest Unofficial Updates, the Ozzfest 2005 lineup, may look like this:
MAIN STAGE
Black Sabbath
Iron Maiden
Anthrax ("Among The Living" lineup)
Black Label Society
SECOND STAGE
Rob Zombie
Mudvayne
Killswitch Engage
A Dozen Furies
Also a possiblity of Life of Agony being involved.
I definitely will be checking that out if the lineup ends up like that. Between Maiden, old Anthraz and KE, this show is shaping up to be incredible.