I'm not a big fan, that our 51 point talent is something that allows us to AoE tank with a lot less facility than a Prot pally. Give us a new 51 point talent aimed at boss tanking and move Shockwave to where SS used to be and dump vigilance.
We also need a talent that gives us expertise since defiance got removed, every other tanking tree for other classes has them. I think adding expertise to Improved Defensive stance could be a quick and easy solution.
Also Improved Thunderclap and Tactical mastery should swap places, the reason for the TM swap is entirely moot now with the advent of WotLK, and Imp TC is also one of the best tanking talents ingame so it makes sense thematically to put it in the prot tree.
Sword and Board also needs a radical reworking, as is for a 5 point talent investment that deep in the tree its very underwhelming. You get more rage per minute from anger management for 1 point, and the threat gain is marginal at best.
Incite is a very nice talent, although i think it should affect SS as well as the other abilities, then it would go from good to great IMO.
Vitality needs to go from 5% stamina to 10%, else the gap between paladins and warriors health is going ot be extreme seeing as we will pretty much be using the same gear.
Safeguard is a strange talent, it doesn't provide us with anything, it increases the survivability of someone else, not sure what Blizz is trying to do with this talent to be honest. Feel's like more of a pvp talent to be honest and could definitely see it being useful in deep arms rather than prot. I'd even go as far as to say make it a base skill for all warriors, but make it a 2 point talent to improve it be in deep arms. Not sure what i;d put there in its place to be honest.
An idea i came up with is Vaunted Defence - 45 second CD, duration 15 seconds, every dodge/parry/block increases our armour by 5% up to a maximum of 25%.
For our 51 point talent I've only got a vague notion of a talent. I got a cool name, Nemesis

I'm thinking something like a 30 second CD, 6 second duration where all abilities cause a significant amount more threat and damage (amount to be determined), and only works against the target you have selected when activated.