Indeed, PG said that Orbital Bombardment will be stronger then regular bombing runs.
As for Anarch's question, I think that bombing runs will be an early game thing, replaced by orbital bombardment if you have the capability. If you have an ISD and Tie Bombers (yeah, they go together, but anyway), you'll only be able to use the ISD's bombardment abilities.
If both were available, it would be an overpowered ability.
It's my take on it