+10% base spell dmg and healing
+4% hit with smite
31% of spirit as spell dmg
smite crits make next smite cost 50% less mana but no crit
and increases dmg done by your smite by 10%
depending on how much spirit gear gets this spec could be deadly :]
i still think they should swap gaurdian spirit with penance
GS will be very good for pvp, even OP.
and giving pve priests another instant cast spell will be awesome (considering: shaman gets DoT and "sharing dmg" spell, paladin gets raid healing and regen spells, druid gets new heal and a raid heal so priests should get like a NS ability. Check the paladin tree they will have a "ns" (reduce 2.5 sec cast on next holy light = instant holy light) after holyshock.
I might be way off the mark here, but this might be preferable.
When you're MT healing it still has the ticks to stack up grace.
When you're trying to kill someone in PvP you can do it on the run without being interrupted.
penance is atm in discipline specc, although i hope it will be a holy talent.
never healer of a pvp healer healing MT... no tanks in pvp...
and i really doubt that dicsipline will become raiding specc - just because i tested it out - and it won't work (holy pver's will understand, but lacking spiritual healing, holy concentration and more holy talents is just to much - so will be really weird to see a discipline priest raid - in end gaming contest ofc).