I think one of the interviews mentioned "Race of Man", "Beasts" and "Fallen". I'd kinda hope for more races than that in the final product (MoM had a rather nice line-up) but that's at least three as it currently stands.
They also suggested that your positive/negative channeling alignment was tied to your chosen (starting? being able to use other peoples stuff as you conquer them is kind-of a staple in the genre) race. I hope that's not true as I liked to mix things up with life magic Dark Elves and death magic High Men and the like.