Ohkawa is no longer Roy! Fullmetal Alchemist's 2009 Anime Cast Revealed!!ANN/2ch reports the cast for the reboot series airing in a few months:
Romi Paku as Edward Elric
Rie Kugimiya as Alphonse Elric
Megumi Takamoto as Winry Rockbell
Shinichiro Miki as Roy Mustang
Fumiko Orikasa as Riza Hawkeye
Kenji Utsumi as Alex Louis Armstrong
Keiji Fujiwara as Maes Hughes
Yuji Ueda as Jean Havoc
Kenji Hamada as Vato Falman
Kaori Nazuka as Maria Ross
Hidekatsu Shibata as King Bradley
Kenta Miyake as Scar
Kikuko Inoue as Lust
Tetsu Shiratori as Gluttony
Minami Takayama as Envy
Hiroyuki Yoshino as Kimblee
Kouichi Yamadera as Isaac
Seems ONLY Ed, Al, Hughes get to keep their roles.
Ueda went from Kimblee to Havoc. @_@
Miki Shin (recently Lockon for G00, famous for Takumi of Initial D) for Roy. WOW, seriously? Huge change is huge.
And get this. Maria Ross: from Saiga Mitsuki to... NUNNALLY OF CODE GEASS. UHHH.... x_X;
Okiayu is gone for Scar, but i think Miyake can do it. He has played pretty gruff characters (Tsume in Wolf's Rain).