The fourth armor set to be revealed is the Shaman Tier set, Spiritwalker's Vestments. Bones and skulls everywhere, almost gives off a necromantic feel. Shamans generally have some of the cooler tier sets, especially Tier 5 and tier 8.



For a flashback trip to all the previous 12 tiers, follow the link.

All other Tier 13 armor sets can be found here:
Tier Thirteen Armor Sets
WarriorColossal Deathplate
WarlockFaceless Shroud
DruidDeep Earth Vestments
ShamanSpiritwalker's Vestments
MageTimelord's Regalia
RogueBlackfang Battleweave
PaladinBattleplate of Radiant Glory
PriestVestments of Dying Light
HunterWyrmstalker Battlegear
Death KnightNecrotic Boneplate


Links
Battle.Net Blog - Shaman Tier 13 and Visual Retrospective