The following sentences in Ghostcrawler's latest blog posting provides us a glimpse into the upcoming changes that will impact how tanks gear to respond to Mists' new avoidance and block mechanics:
"The chance to block will be handled by a separate combat roll for each attack that is not avoided. In other words, we first determine if an attack misses, or is dodged or parried. If it is not, then the attack has a chance to be blocked."
"We don’t expect Protection warriors or paladins to get “block capped” other than during temporary effects, such as mastery procs on trinkets. Block tanks will be balanced around this change. Our intent is to make playing block tanks more fun, not to nerf them."
- source
Obviously it is too early to consider anything seriously nailed down to the deck. However, based on what we know now, we can make some general assumptions:
- gone are the days where there is ONE combat roll and the result of that roll is determined against one table of values
- gone are "un-hittable" tanks
- all tanking classes will have the same chance to be missed
- druids will stack dodge
- warriors, paladins, death knights, and monks will stack dodge and parry
- monks and death knights will likely have higher stacks of dodge and parry than warriors and paladins
- warriors and paladins will stack dodge, parry, and block
Which gives us three likely types of tanks:
- dodge tanks (druids)
- dodge and parry tanks (monks and death knights)
- block tanks - really "dodge, parry, and block tanks" (warriors and paladins)



