I think the TIE Striker, ARC and U-Wing are strong possibilities in the future. TIE Advanced Prototype maybe.
Correct me if I'm wrong, but aren't the Tie Strikers atmospheric fighters? Don't know if they would make sense in space, but maybe they are duel roll.
I think most new ship, like many have said, will come from new canon material. I think you could definitely bring in some old cannon stuff if you opened up a third faction, but I REALLY don't want a third faction. Star Wars, to me, is all about the Rebellion vs. Empire.