I’m not optimistic that we’ll keep the Salv glyph, but we’ll see. As to Holy Shield, it is going through rapid iteration. Our current implementation has it providing 5% block per stack of Holy Power, up to a max of 15%. So you can use Holy Power for threat, healing or mitigation depending on current circumstances. You should be able to keep the 15% block up all the time with a very small amount of effort.

Warriors get 15% block baseline, so this means the paladin has to work harder for it. Seeing as how the paladin doesn’t have to maintain Demo Shout or Thunderclap’s debuff, this doesn’t seem too great a burden. (Source)