Me being the priest I am, I did some more research. I suspect
this to be the disc cookie cutter for what we currently have. Yes, that is a Smite glyph there - how awesome is that? The disc build works out nicely due to the fact that you've got Penance. You don't badly need those mana-reducing talents, you don't need Improved Renew since PW:S fills that role, and while picking up Deliverance could be nifty, you don't need speedy heals - you've got Penance. With all those talents, in IcC-25 gear, you'll be looking at what would now be 7K+ non-crit Smites. Before gaining any stacks of Evangelism. Which, with crits and the glyph buff included, I believe would result in an average of 5 to 6K DPS. Which in turn is 2.5 to 3K smart-HPS. Which already looks fairly balanced on paper.
As for holy... A holy priest can, if he really wants to,
do the Smite trick as wel, but he will have to drop some of the obscene amounts of utility holy now has. Whether that's an improved Renew, Choir Leader (my personal choice, it's nice but not a necessity), Body & Soul or Improved Holy Nova is pretty much their own choice, though. If you're a disc/holy priest though, you already have the Smite trick in your disc spec and I'd purely go for all the utility I could get, more
like so, possibly even dropping PW:B or Improved Healing for Test of Faith.
Long story short, it'll come down mostly to preference, like Blizzard did promise. You have more than enough points to pick up all the 'must-have' talents and what you'll be shuffling with is the fun utility ones. Holy priests have a tougher time than disc priests in 'grabbing everything they want', though, since A) Archangel is so far up the disc tree and B) I'm keeping one point in the back of my mind for Lightwell, assuming they finally get around to making it worthwhile. Disc/holy priests will have it easier than holy/shadow priests in any case, though.
Obviously, we don't know what is going to be changed and how it's going to be done, but these words really are a good summary of my thoughts so far.
Edit: Great - the Wowhead editor is bugged and the MMO-champion editor can't link. I'll edit in better links lateron, when those sites get their stuff working.
Edit2: Edited in the right builds.
Edited, Jun 11th 2010 2:30am by Mozared Edited, Jun 25th 2010 7:27pm by Mozared