When an album is released, I'll put it in the topic with the released ones...
Now...some upcoming albums (need help to add more):

Soulfly - Conquer (29 July 2008) (already on the internet)

OOMPH! - Monster (August 22, 2008)

Slipknot - All Hope Is Gone (26 August 2008)

Alice Cooper - Along Came a Spider (August 2008)

Trivium - Shogun (30 September 2008)

Metallica - Death Magnetic (September 2008)

Cradle of Filth - Godspeed on the Devil's Thunder(27 October 2008)

Deftones - Eros (December 2008)

Anathema - Paradigm Shift (Late 2008)

Sepultura's 11th Studio Album (eventually 2008)

Alice in Chains' fourth studio album (eventually 2008)

Slayer's tenth studio album (1st quarter of 2009)

Rammstein's 6th studio album (2009)

Trust Company's 4th studio album (2009)

Papa Roach - Metamorphosis (release: TBA)

Korn's ninth studio album (Summer 2009)

Guns N' Roses - Chinese Democracy (2012)