Alright, they fixed the crash problem this build, and there's loads of new and interesting stuff for holy. I'll start off for disc, though.
Power Word: Barrier still sucks. 30K absorption, 0.5 a second cast, 2500 mana and 3 minute cooldown. It's basically an underpowered, expansive cooldown as it is now. On the other hand, I played around with Evangelism and Archangel, and... holy crap! Literally!
Get this;
Archangel is off the GCD. It has a 15 second cooldown and returns 15% of your mana at full stacks. In my gear, that's ~6300 mana. Smite costs 579. Five Smites cost ~2900. Meaning that after 7.5 seconds, I'll have gained ~3450 mana. Let me turn that into more readable terms. 7.5 * 0.666666~ = 5... 3450 * 0.666666~ = 2300. That's right - casting five smites and then throwing down Archangel gets you a netto 2300mp5. With the way it looks right now, a disc priest will be wanting to cast Smite pretty much
every second he doesn't have to heal. The mana gain is so large, it's an extremely attractive alternative to standing around and waiting for incoming dmaage. Not to mention Smite scales with haste.
Aside from that, not much new stuff for disc. Moving on to holy.
Holy batman explosion. The talent tree has been changed quite a lot. For one, you no longer have to grab Lightwell. On the other hand, if you don't grab it you get stuck at a point where you need to spend one point to get a tier up and you can't really put it anywhere, so I grabbed it anyway in
my holy build (last 5 points go into Imp. PW:S and Imp. Inner Fire or Evangelism/Archangel). The new Chakra is awesome, and holy as it is right now is actually more fun than disc as it is. So holy priests - rejoice! Let me try and explain how it works.
Basically, the new 'ability' you get when you spec holy is Holy Word: Chastise. This is an instant spell that deals some damage and roots the target in place for 2 seconds - it's obviously mostly a PvP ability. The thing is, it changes depending on the Chakra state you're in. If you cast Chakra and then cast Heal, you go into 'tank healer mode', and Holy Word: Chastise becomes Holy Word: Serenity, which is basically an instant heal that gives you +25% crit chance on the target. Aka you throw it on the tank you're healing, and suddenly you're critting all over the place. For Renew Chakra, it turns into Holy Word: Aspire, which is basically a modified Renew - a large instant heal, then a small DOT that lasts for about 10 seconds. For Prayer of Healing, it turns into holy's own Power Word: Barrier, aka Holy Word: Sanctuary - you turn the ground... icy, at the moment (the effect is hopefully placeholder), and people in it will get a small heal every two seconds for fifteen seconds. Which in turn works great with the raid healing function you're taking at that moment.
Twirling Light seems to be a nerf from Surge of Light (especially because you don't always need your Flash Heal to be instant, especially not if that means it's gonna suck), but it seems to be NYI as it doesn't work at all, so I can't say.
Last but not least, it seems obvious that right now the best way to level is go disc first for Archangel, then respec to holy as soon as you can get Chakra. State of Mind allows you to keep the Smite Chakra up indefinitely as long as you pull enough mobs, and it's pretty nifty for leveling, even if it makes your rotation somewhat boring. That said, Chakra still seems a bit bugged - I can currently have an infinite number of Chakra's up if I have the GCDs to support it (there is still a maximum of 30 seconds on each respective Chakra buff, though).
Now that I know all my spells and have them bound, I'll report back later after I get some questing done.