This is just a little Theorycraft of mine:
EDIT: New Talent tree:
https://www.wowhead.com/beta/talent-...VVURVRJUYIGFBU
My intention of this is following:
This is not a DPS build and i doubt that even with this holy will be a viable DPS alernative. But with the new Profile-System, this might be actually a high dps healer with many Instant-Heals and Holy Words.
My intention: Keeping Holy Word and Renew on as many targets as possible (renew on tank, rest get it throuth PoM), Cast Holy Fire, Fish with Smite for the Surge of Light Procs, using your Holy Words for big heals, then high Flash Heal free instant casts with both SoL and Resonating Words. Since every Holy Word including Chastise, Life and Salvation will Proc RW compared to Cosmic Ripple (that should have quite high uptime to through the many Procs of SoL), the Uptime of it should be quite high thanks to Smites and Holy Fire reducing Chastise's CD with Light of the Naaru.
My issue with the whole build is only one thing: How long is the cast time of Holy Fire? Since it seems, Burning Vehemence will reduce it up to 50%, we would actually have a base holy Fire cast time of 2-3 Seconds. How much damage does Holy Fire deal; since it's no longer instant cast, i really hope the scaling is much better than it is now. If not, the build is DoA
And i really hope blizzard makes this work by overworking this part a bit. They should really make Holy Fire also trigger Surge of Light. With this little change i think this would make this type of Priest that they seems to be pushing work. What they also hopefully consider is that Resonating Words should have 2 Stacks like Surge of Light. Having so many Holy Words up left and right, this will actually be necessary to keep it up.