Hm, Linkin Park, that's gonna be a well produced bad album. Linkin Park is annoying and doesn't have good musicians, but they sometimes come out with a decent sounding song.
but for the uninformed, here's a list of what he's done so far and a few of what he's planning on doing, taken from wikipedia
Radio - LL Cool J (1985)
Licensed to Ill - Beastie Boys (1986)
Raising Hell - Run-D.M.C. (1986)
Reign in Blood - Slayer (1986)
Electric - The Cult (1987)
Danzig - Danzig (1988)
Tougher Than Leather - Run-D.M.C. (1988)
South of Heaven - Slayer (1988)
Masters of Reality - Masters of Reality (1988)
Andrew Dice Clay - Andrew Dice Clay (1989)
Trouble - Trouble (1990)
Danzig II: Lucifuge - Danzig (1990)
Seasons in the Abyss - Slayer (1990)
Nobody Said It Was Easy - The Four Horsemen (1991)
Manic Frustration - Trouble (1991)
Decade of Aggression - Slayer (1991)
Blood Sugar Sex Magik - Red Hot Chili Peppers (1991)
Danzig III: How the Gods Kill - Danzig (1992)
Thrall: Demonsweatlive - Danzig (1993)
21st Century Jesus - Messiah (1993)
Danzig 4 - Danzig (1994)
American Recordings - Johnny Cash (1994)
Divine Intervention - Slayer (1994)
Wildflowers - Tom Petty (1994)
One Hot Minute - Red Hot Chili Peppers (1995)
Ballbreaker - AC/DC (1995)
God Lives Underwater - God Lives Underwater (1995)
Empty - God Lives Underwater (1995)
Unchained - Johnny Cash (1996)
Undisputed Attitude - Slayer (1996)
Diabolus in Musica - Slayer (1998)
System of a Down - System of a Down (1998)
Chef Aid - South Park (1998)
Californication - Red Hot Chili Peppers (1999)
Loud Rocks - V/A (tracks: 1. System of a Down & Wu-Tang Clan - Shame, 6. Tom Morello & Chad Smith & Wu-Tang Clan - Wu-Tang Clan Ain't Nothing Ta Fuck Wit) (1999)
American III: Solitary Man - Johnny Cash (2000)
Paloalto - Paloalto (2000)
Renegades - Rage Against The Machine (2000)
Amethyst Rock Star - Saul Williams (2001)
Toxicity - System of a Down (2001)
American IV: The Man Comes Around - Johnny Cash (2002)
By The Way - Red Hot Chili Peppers (2002)
Audioslave - Audioslave (2002)
Steal This Album! - System of a Down (2002)
Results May Vary - Limp Bizkit (with Terry Date and Jordan Schur)
Unearthed - Johnny Cash (2003)
De-Loused in the Comatorium - The Mars Volta (2003) (with Omar Rodriguez-Lopez)
The Black Album - Jay-Z (2003) ("99 Problems")
Live at the Grand Olympic Auditorium - Rage Against the Machine (2003)
Heroes and Villains - Paloalto (2003)
Vol. 3 (The Subliminal Verses) - Slipknot (2004)
Armed Love - The (International) Noise Conspiracy (2004)
Crunk Juice - Lil' Jon and the East Side Boyz (2004) ("Stop Fuckin' Wit Me")
Make Believe - Weezer (2005)
Out of Exile - Audioslave (2005)
Mezmerize - System of a Down (2005)
Hypnotize - System of a Down (2005)
Fijación Oral 1 - Shakira (2005)
Oral Fixation 2 - Shakira (2005)
12 Songs - Neil Diamond (2005)
Stadium Arcadium - Red Hot Chili Peppers (2006)
Untitled - Justin Timberlake (2006)
Untitled - Linkin Park (2006)
Untitled - Slayer (ending 2006)
Untitled - Metallica (2006/2007)
Untitled - Kid Rock (2006/2007)
Taking the Long Way - Dixie Chicks (2006)
American V - Johnny Cash (2006)
Untitled - System of a Down (possibly 2007)
So you can see he sort of just flows with the times. Not everything is going to appeal to the ones who know him from stuff like slayer and Danzig.
I'd be more concerned with Justin Timberlake than Linkin Park.
As for Metallica, it's gonna be more up to them than Rick Rubin.
7 albums in 2005?