Will they promote from within?
I think it is possible, but it's more likely they hire someone from outside. I think they'd like a fresh voice and someone who has had success in another organization. That said, if they can't find the right person from outside, they could look internally. Bill Castro, who took over for Rick Adair in August, is apparently still in the mix, though I think it is more likely he ends up in another role in the organization or, potentially, back in charge of the bullpen.