A good summary of the proposed timetable enhancements (and pros and cons) is here.
http://www.charlbury.info/files/1/NorthCotswolds.pdf(not sure whether it differs to what is posted above as it is from mid 2014)
Overall, it looks very promising with a peak Kingham stop and several Pershore stops axed (as we have already discussed). There is also a planned 2 hour time service in the middle of the day.
Once Reading is re-built, I would hope a further 5 minutes could be cut from
HST▸ and 180 timings.
Once there is more stock, a few extra services extended to Charlbury or Morteon would be good, allowing more Hanborough and Kingham stops to be axed without affecting those stations.
Shame I don't use the line any more...