We still don't know the maneuver dial for the TIE Defender. A TIE Avenger could have similar stats to the Defender (3/3/2/2?), a different dial, and different pilots. Maybe something a little more affordable than the defender but nonetheless tricky to fly.
The Avenger might also introduce, for example, a new Beam weapon upgrade slot so it could take things like tractor beams and jamming beams like we've seen in the games. Maybe an upgrade that could also carry over to the Assault Gunboat (and eventually Missile Boat?).
Otherwise the Avenger might be a small ship to mount the Systems upgrade slot since the Defender doesn't have it. Avengers were often described as maneuverable, speedy, and kind of hard to hit, which could be covered by any of the systems slots out there now (Advanced Sensors, Sensor Jammer, etx).
