I tend to doubt they will be.
It's a toss up, Leia Bousshh's Leia head was resin, Asajj's heads were rubber, though much softer than HT so wouldn't want that soft/hollow a head. I think the rubber like HT is better for a figure like Indy with interchangeable heads, I think resin runs the risk of changing it too many times and having the socket widen enough it doesn't grip as tight, and the rubber material leaves less concern for damage in the removal process, I've popped my Jack Sparrow and Rambo 3 heads off plenty of times with no issue.