Blizzard has released a preview of the Paladin Tier 13 armor set that will be available in World of Warcraft Patch 4.3. You can click on the above image to view a larger version. Here's their description of the Battleplate of Radiant Glory:
"Design requested a set to ‘key off the Guardian of Ancient Kings summon,’ and I though the concept of ‘feathered’ plate mail, rendered in silver and gold, would create an aggressive, yet sweeping and powerful silhouette. The previous paladin raid set had a good deal of cloth, but we wanted this set to be entirely platemail.
The key to a strong paladin tier is hitting a balance between martial prowess and elegant grace -- tapping into that classic Arthurian knight archetype."
In addition to the Tier 13 reveal, Blizzard has posted a visual guide to paladin Tiers 1-12 for Transmogrification purposes. You can view the paladin's armor history after the jump, and check out Wowhead's guide to find all your old tier gear. Also, be sure to browse through all of the currently released Tier 13 previews.