As far as I'm aware, out of the current Thameslink services, only the Wimbledon loop line will lose it's through service by terminating at Blackfriars, which leaves the current Southeastern/FCC service to Sevenoaks which runs via Catford as it is.

However the increased capacity at London Bridge and the reduction in platforms gives us on the FH/HOP line the opportunity to have at least 2tph to either Luton (replacing the Wimbledon services) or Bedford stopping at all stations.

Speculation on my part is the possibility they'll replace the current Caterham stoppers (which would still call at NXG and Norwood Junction on the fast line) with Southern keeping the Victoria to LB via Crystal Palace terminating at LB.

Incidentally, as the new timetable is now in force, on Sunday we now have 8 carriage trains on the East Croydon route to LB as Southern operate a split service to Caterham/Tattenham Corner.