Judging from leaked videos, the choices are: American, Irish, Scottish, Chinese, and four variations of African accents.
Again, (search these voice actors to see their origin, I'm 90% close on them all, it's impossible to define a couple because they're a mix of accents in one vocal but the rest are certs)
Damian O'Hare (Northern Irish)
Ray Shell (African American)
Alec Newman (he's a Scottish actor but portrays a sort of American movie-style accent)
Jimmy Akingbola (English accent - of Nigerian descent so he sounds black)
David Yip (Asian/Mix - he's normally got a strong English accent, but makes up an accent for the game and it has a bit of Asian in there I believe)
Dhafer L'Abidine (Tunisian actor, although portrays a unique accent which sounds a mix of S.African/N.African)
Ryan McCloskey (American)
Richie Campbell (Carribean/African/American style)
:brokencomputer: