Preliminary Tier Lists

I'm not a firm believer of tier lists but I see value in anything that gives me some insight into what the metagame is going to evolve into. The most notable change is how Abel has jumped from C in vanilla to A+/A in SSF4. This is purely speculation at the moment so no one knows what's going to happen 3 months from now. Dan might make A+ tier for all you know.

EDIT (10 Jan 2011):
6 months since the first tier list, we have the latest list by iPlaywinner. Things still look pretty much the same, but with the nerfs on Abel in AE this list might change pretty soon.

iPlaywinner Tier List (Jan 2011)

A: Akuma, Fei-long, Guile, Cammy, Chun-li, Dictator, Boxer, Honda, Abel
B: Ryu, Rufus, Dhalsim Viper, Seth, Zangief, Ibuki, Sagat, Dudley, Blanka, Dee Jay, Juri, Adon, Ken
C: Rose, Claw, Elf, Guy, T.Hawk
D: Cody, Gouken, Gen, Makoto, Sakura, Dan, Hakan

Japanese Tier List (May 2010)

A+: Sagat, Rufus, Abel
A: Guile, Dictator, Chun-Li, Honda, Gouki, Ken, Ryu, Vega, Ibuki, Dhalsim
B+: Rose, Zangief, C.Viper, Dudley, Seth, T.Hawk, DeeJay
B: Juri, Cammy, Balrog, Blanka, Gouken, Cody, Adon, ElFuerte
C+: Makoto, Fei-Long, Sakura, Hakan, Guy, Gen
C: Dan

Ozhadou Tier List (May 2010)

A+: Sagat, Rufus
A: Abel, Guile, Balrog, Dudley, Chun-Li, Zangief, Honda, Juri, Akuma, Rose, Bison
B+: Ken, Ryu, Dhalsim, C.Viper, Adon, Gouken, Ibuki, Sakura, Seth, T.Hawk
B: Vega, Cammy, Blanka, Cody Makoto, Fuerte, Gen, DeeJay
C+: Fei-long, Hakan, Guy
C: Dan

Eventhubs Tier List (May 2010)

A+: Rufus, Abel, Sagat, Guile
A: Dhalsim, Bison, Ryu, Ken, Balrog, Chun-Li, Ibuki, E.Honda, Akuma
B+: Dee Jay, T.Hawk, C.Viper, Zangief, Dudley, Seth, Rose
B: El Fuerte, Adon, Vega, Blanka, Cammy, Cody, Juri, Gouken
C+: Hakan, Guy, Fei Long, Gen, Makoto, Sakura
C: Dan

IPlayWinner Tier List (May 2010)

A+: Rufus, Akuma
A: Abel, Bison, Ryu, Chun-Li, Balrog, E.Honda
B+: Zangief, Ibuki, Sagat, Guile, Blanka
B: Cammy, T.Hawk, Juri, El Fuerte, Dhalsim, Ken, C.Viper
C+: Seth, Fei-Long, Dee Jay, Cody, Dudley, Adon, Gouken, Rose
C: Gen, Claw, Guy, Hakan
D: Makoto, Sakura, Dan

Global Ranking - Mago & Nemo (July 2010)

A: Guile, Abel, Chun-li, Bison, Honda, Boxe, Rose, Blanka
B: Ryu, Dhalsim, Claw, Ken, Rufus, C. Viper, Akuma, Fei Long, Cammy, Gouken, El Fuerte, Cody, Sagat, Ibuki, Zangief, Seth, Guy, Adon
C: Sakura, Dudley, Juri, Dee Jay, Hakan, Makoto, Dan, T. Hawk, Gen

Arcadia Ranking - Mago & Nemo (July 2010)

A: Balrog, E. Honda, Guile, Fei Long, Cammy, Rufus
B: Abel, Dictator, Blanka, Chun-Li, C. Viper, Ryu, Dhalsim, Akuma, Sagat, Rose, Ibuki, Zangief, El Fuerte, Claw, Gouken, Ken, Seth
C: Adon, Dee Jay, Juri, Dudley, Cody
D: Gen, Sakura, Guy, Dan, T. Hawk, Hakan, Makoto

Japanese Tier Listing (July 2010)

A: Chun-Li, Honda, M.Bison, Guile
B+: Balrog, Cammy, Ryu, Abel, Rufus, Sagat, Seth
B: Dhalsim, Akuma, Fei Long, Rose, Blanka, Ken, Zangief, Dee Jay, Adon, Ibuki, Vega
C+: Cody, C.Viper, Fuerte, Dudley
C: Gouken, T.Hawk, Juri, Sakura
D: Guy, Gen, Dan, Hakan, Makoto