They had their chance to update the x-wing with the transport expansion, and did to an extent, but any further changes aren't likely or they would have addressed them already.
Or they're holding out for Rebel Aces 2: X-Wing and Y-Wing with alt paint schemes.
Oh, I very very much hope so. On top of that, they can give the TIE Bomber some love in its own pack. Maybe stick a TIE Fighter in with it. Not that the TIE/ln has anything wrong with it, but...neither did the B-wing