I saw these posted elsewhere. They come from EA Sports Licensed Players Creation Centre Database:

via sitelife.soundersfc.com

If you held off on buying FIFA 13 I can tell you right now you will be VERY happy with the Sounders player OVR ratings. They seem very realistic now. FIFA 12 ratings in ()s
Gspurning - 74 (was 70)
Johansson - 66 (was 65)
Ianni - 65 (no change)
Hurtado - 65 (was 67)
Parke - 66 (no change)
Gonzalez - 63 (was 61)
Scott - 63 (was 60)
Burch - 63 (was 61)
Alonso - 76 (was 73)
Tiffert - 74 (was 76)
Evans - 65 (was 64)
Rosales - 77 (was 74)
Zakuani - 71 (was 72)
Montero - 75 (was 74)
Estrada - 64 (was 57)
Cato - 65 (was 56)
Carrasco - 61 (was 60)
Ochoa - 62 (no change)
Meredith - 59 (was 58)
Ford - 58 (was 57)
Sodade -60 (no change)
Duran - 60 (no change)
Tetteh - 57 (was 60)
Weber - 57 (no change)
Seamon - 55 (no change)
These players were not in FIFA 12
Johnson - 71 (he was last in FIFA 11 and was 69)
Martinez - 68 (he was last in FIFA 10 and was 63)
Caskey - 64
Rose - 63
Steres - 61

Team OVR rating: 70 (A solid 3 star team)