I don't really care how it plays out but I'd like to see Nero playable in some fashion. Nero just scratches that Nelo Angelo itch for me and I'd like to see more of that in future installments. I love me some Mighty Glaciers and I cannot lie.
Just toss Kryie out the window, they did that for Thor's girl in the Avengers and I figured that worked out nicely.
Not to say that I don't like or mind Dante, Nero just has my attention at this point.
I'd prefer it like DMC 2, but with different levels like it's already been said. I actually like Nero and I want his story continued. It seems like such a waste to be brought on as a new protagonist and then be completely ignored after. I'm hoping (against all logic) that he'll be returned to.