I really hope they do something about Protection/Tanking specs in PvP. While I don't want the shildbearing specs to be useless, I don't want Vengeance to make them truck-throwing monstrosities. 10% of 100k HP is 10,000 free attack power. Consider that Shield Slam uses a 100% AP coefficient, and three-point Shield of Righteousness is 90% and ignores Armor, you're looking at some ridiculous guaranteed numbers.
Also, the self-preservation of Blood looks to be beyond ridiculous. 20% of your Max HP every 30 seconds. 17.5% of it every Death Strike. Shields absorbing damage relative to how much health you healed.
Depending on how they balance PvP (when they start), going Protection/Blood may be the best way to go, or the worst. We'll have to wait and see.