I think at this point,
The fact that all the Attack Shuttle pilots are unique in the Ghost expansion I think is FFGs way of saying "Hey, we aren't putting generics in here because we don't expect you to fly more then one of these."
With that said, I think it's safe to assume this is the only place we will see the Attack Shuttle. That is, unless the Rebels really struggle to find new ships to release in future waves. If that for some reason becomes the case, I can see them revisiting this lil guy. Though I'd rather they didn't. Not the prettiest ship.
Counterpoint: the ship has four pilots and looks like they should all fit in a 100-point game, so clearly they expect us to buy four expansion packs.
But you can't fit 4 with TLTs. I think 4 HWKs with TLTs would be better.