Just an American accent. Assuming you're American, pretty much the way you hear everybody talk. I can't really think of any other way to describe it. I don't think people are referring to the southern hill billy accent but a much more general American one.
I never knew I shipped these two until now.
I posted in another thread about this, so I'll just pretty much reiterate what I said there. I am very very apprehensive about this. Video games typically don't translate well into other mediums. The puzzle-solving, the adventure, etc., the...