Will zonal rail tickets show origin/destination stations like they do at
present and therefore a return be A to B & back to A only? Or could I
buy a Zone 1 to 5 Rail only CDR say to go from Victoria to East Croydon
and later in the day Bromley South back to Victoria?

www.nationalrail.co.uk confirms that although zonal tickets will be
issued they will still be point to point and I quote "We are
considering whether in future we could make buying tickets in London
simpler still by offering tickets to specific zonal destinations.
However at present this is not practical." Surely it's easy to make
pratical if the tube can. Basically the system will simplify fares
without the zonal travel flexibility and so in the short term just
means fare raises of untold proportions for most people...a real "win"
for everyone! If this was a truly zonal system this would have been
great.