Well, I've logged about 20+hrs tanking in 3.0 Have to say...even in the gear that I have, it so rocks.
I love the change to Blessing of Sanctuary. The mana return is just hot. I was a bit worried when they took away our Blessing of Salvation (ok, it's not gone, but really...10 sec? I have used it once in 20hrs of play) as it was a major tool in keeping threat. Ahhh, but the changes in how spellpower is added is HOT!!! Holy Shield is the best. Went from doing 128ish to over 300 pts/hit!! Conceration get some more, but not as much of an improvement. Still, if you stick to the way you have been playing Conceration (spam it once, maybe twice to get threat and your good) it's nice to have the added damage. Hammer of Righteous rocks. I spam it all the time. Reminds me of Crusader Strike for Ret (except that it hits up to 3 targets). I've been trying to get the Glyph of Avengers Shield, so that it hits a single target for 100% more damage instead of 3 targets, but they are charging something like 500g and well, I just don't have the time to farm it between actual test play and my guild. Touched by the Light is nice. My stam is 812 giving me +81 spell damage. Nice, yes. And with the added Holy Damage added into your spells it adds up. I would probally go with +200sd anyway, just factor in your TBtL bonus (+40 spellpower chant and TBtL +81= +121 leaving a meer 79pts to find) Could actually find a +stam/str wep and get your +sd somewhere else (as str does add to your block and it's ALL about the block).
The new judgement system is cool. Seal up for 2 min. It does have a 4sec internal cd, but hey, it procs for more that the Blessings did, and sticks around longer. You can judge 3 different kinds, Wiz (+mana), Light(+health), Just(stops them from fleeing). Everytime you judge it will do x Holy damage (depending on the Seal you have up) and land the Judge you picked. The Judge sticks around for 30 sec and then goes by-by. No, it does not refresh with your hits. Now this is good and bad. Good because even without Improv Judge your cd is 10 sec (plenty of time to wait for your first to expire) and second, when you do pop it down again you do x more damage! Bad, well one more timer to worry about (yeah, I'm kinda lazy :-)
So combat goes something like, Pull (my pick is Avengers Shield), Seal of Light, Judge Wiz, Holy Shield,(Concerate if you have more than 3 mobs) and Hammer of Righteous every cd. I keep up my Judge Wiz, Holy Shield and again HoRight every cd. Hammer of Wrath for a finish if you need. The first thing I noticed is how fast my mana came back! Yes, well Blessing of Sanctuary returns 2% of your max mana every block, Holy Shield Delivers more Damage (bigger + from your spellpower) and if they do get through, you've judged them. If you though you could watch tv and mad grind before, get the popcorn out! Down time is so low. We have also become much more viable as a MT. With all said before, and adding your
Glyph of Avengers Shield you can get some great threat up front, and with HoRight keep it going. Get your Imp Judge and every 8 sec be hitting him with even more Holy Damage as you pick your return for the moment (what you need? Life? Mana?).
Basically, If you loved being a prot pally before, your going to make love to it now (imo)!!
I'm sure there are other things I've either forgot to say/stress like how Str imp your block (which is imo now the most imp thing you can have... ohhhh, checkout the BrewBoss
Trinket and TBtL is a great tool for Spellpower, (so gear by desire is Block (rating), Stam, Str). But then... I really am just a casual player.
I'll keep you posted...