The big news is that Tricia Helfer of BSG's Caprica Six fame is voicing Sarah Kerrigan, the Queen of Blades and that (ooh, I just love this) Robert Clotworthy is reprising his original role of Jim Raynor, woohoo!! - as is James Harper as Emperor Arcturus Mengsk). Blizzard have also hired probably the best voice director in the world - recipient of 7 Emmys Andrea Romano!

Voice Cast of Starcraft 2:

Robert Clotworthy as Jim Raynor
Tricia Helfer as Kerrigan
James Harper as Arcturus Mengsk
Neil Kaplan as Tychus Findlay
Fred Tatasciore as Zeratul
Dave Fennoy as Gabriel Tosh

and Andrea Romano serving as Voice Director