Blizzard has released a preview of the Warlock Tier 13 armor set that will be available in World of Warcraft Patch 4.3. Here's their description of the Faceless Shroud armor:

"A set with the flavor of the Old Gods about it - General Vezax from the Ulduar raid was a reference point. Any warlock tier is a great opportunity to bring a dark and warped aesthetic to player gear and this set was especially ripe for the treatment.

Replacing the caster’s face with writhing tentacles was the ‘hook’ I started the concept with and built out from there. We always try to include numerous points of illumination into a tier set as it helps to tie the various armour pieces together – whether that be glowing gemstones, fiery runes or, as in this case, bulging otherworldly eyes!"

In addition to the Tier 13 reveal, Blizzard has posted a visual guide to warlock Tiers 1-12 for Transmogrification purposes. You can view the warlock's armor history after the jump, and check out Wowhead's guide to find all your old tier gear.