Firstly, Indirect Fire now only hits on sixes, unless you Remain Stationary AND have a spotter unit.
Secondly, if you Advance and shoot (making use of Starshatter or the Awakened Dynasty Assault strat), you now can't use Indirect Fire at all. This is because Assault and Indirect Fire now work via different "shooting types". Using Indirect Fire is only possible when you don't Advance. But you'd only be hitting on sixes anyway because you didn't Remain Stationary.