Yep, the 'present' timetable, the Bath - Trowbridge leg is commercially operated, with the bit to Warminster subsided by WCC - hence it's cutback.
Will be interesting to see the re-routes in Trowbridge. If Traveline is anything to go by the Bath bound service will stop at Fore Street rather than the Town Hall, I guess this may speed up services by not going round County Way/Roundstone Street, unless it's a typo.
In Westbury, It's a shame they can't sort out the weight restriction on the railway bridge by the station which causes the route to loop round the trading estate and Slag Lane, that must add a fair few minutes - and apart from the outstation swap-over I've not seen that many people board from that part of the route.