I don't think there will be many domestic routes by FR, ADP will have quite a big effect on domestic and many routes are thin, could they fill 2 or 3 rotations to LBA or EMA? JET2 tried LBA which is their main base and failed
Personally (and you can shoot me down if you want) I would not be surprised if the next domestic route to be announced is STN. London is the big money spinner from NI and more than likely needs the least marketing