As I've said before in other Wave 3 speculation threads, the only concrete rumor we have is the Homing Missiles card art.
That being said, very few people mention the Chiss for Imperials. How awesome would a chiss clawcraft be? There are plenty of examples of pilots. I think there are nearly endless possibilities of ships, and if FFG continues to hold the license, I think Ep 7 TIE-in ships (pun intended. ) will definitely come out as excitement grows for the new movies.
Good point. The Chiss would add an entire new aspect to the Imps, but who would the Rebels get? The Chiss Ascendancy had some pretty awesome fighters.