For starters, warriors get a variety of changes aimed at tanking: Warbringer allows a prot warrior to charge in combat, in any stance, Thunder Clap's damage is increased by 50%, and Damage Shield, a new ability, causes warriors to deal damage whenever hit by a damaging attack or when they block an incoming attack equal to 10/20% of block value. With the new way strength adds to block, this is an indirectly scaling with AP ability. Improved Shield Block now is folded into Shield Mastery, Vitality now adds expertise in addition to strength and stamina, and several abilities have had their threat reduced but their direct damage increased to compensate. A change that surprised me greatly was seeing Sword and Board now adding yup to 15% critical strike chance to Devastate in addition to resetting Shield Slam's cooldown and reducing it's rage cost by 100%. This could make devastate a very attractive DPS option in the right gear.
And Shield Wall is back up to 60% damage reduction for 12 seconds. The Improved Shield Wall talent is gone, replaced by Improved Disciplines, which lowers the cooldown on Retaliation, Recklessness and Shield Wall by 60 seconds max.