So as everyone knows Autothrusters are likely to bring Interceptors back into the tournament scene by letting them endure Falcons and Outriders. Most Interceptors will be balanced out by having to choose between the focus and evade actions, and if they focus they have to decide if they need it for attacking or defending (but I imagine they'll always defend with it).
Soontir Fel is not most Interceptors.
With his ability, Soontir can effectively guarantee two negated hits every turn, one for the Autothrusters and one from evade. He will have a focus token available, possibly two if he didn't need to reposition after moving. And like most Interceptors, he can dance much better than the Falcon and stay out of it's arc very easily. All Interceptors are getting a buff but Soontir is the only one that can maintain a good offence with his second focus token.
So for someone that wanted to play a YT, how would you counter the Baron?
Personally I think the best way would be to have the Falcon ignore him entirely and start shooting up his escorts, while the rest of your list relentlessly chases Soontir. Corran presents a solid threat, and with barrel roll he should be manoeuvrable enough to at least keep Soontir busy. The Outrider can handle him better than the Falcon, because Dash can boost and roll into a better spot and four dice are better than three, especially against a guy that can stop two dice per turn not matter how much the dice hate him.
The upside to all that is that it maintains a lot of the manoeuvring mindgames that people like while still letting Rebels have their turrets. You can't mindlessly drift in circles and expect to win, because you need to position your ships to keep Soontir either in front of you or as far away as possible. Likewise the Interceptor still only has three hull so mistakes will be as fatal as they always were.
For the record I think Autothrusters are aggressively costed but not broken. I played a lot of games with the Falcon and even my most casual lists were murder on Interceptors. They don't do much if you aren't playing against turrets but I don't think they're an "I win" button against turreted ships either. They change the decisions you have to make, but if you haven't been using turrets it should actually be pretty easy to adjust.