We do know that armor on necklaces, rings, and trinkets is going to be significantly nerfed (no longer giving the bear multiplier effect) and that armor on weapons will be going away, so you might want to have some replacements ready in these categories, should these turn out to be superior. Agility and stamina will likely be the number one tanking consideration for the weapons.
From
Protection Gear Quick Reference I see some interesting pieces.
Necklaces:
[Shadowseeker's Pendant] - 200 - Heroic Ahn'kahet (Jedoga Shadowseeker, 3rd boss)
[Chained Military Gorget] - 200 - Badge Vendor (25 Emblem of Heroism)
Cloak:
[Cloak of Peaceful Resolutions] - 187 - Wyrmrest Accord Reputation (Honored)
[Flowing Cloak of Command] - 187 - Normal Culling of Stratholme (Salramm the Fleshcrafter, 2nd boss)
[Cloak of the Enemy]- 200 - Heroic Nexus (Commander Stoutbeard/Korlug, optional boss)
[Durable Nerubhide Cape] - 200 - Crafted (Leatherworking 440)
Ring:
[Staunch Signet] - 175 - Quest Reward (The Struggle Persists)
[Dragonflight Great-Ring] - 187 - Normal Oculus (Cache of Eregos, ???)
[Titanium Earthguard Ring] - Crafted - (Jewelcrafting 430)
[Keystone Great-Ring] - 200 - Heroic Drak'Tharon Keep (The Prophet Tharon'ja, last boss)
[Signet of the Impregnable Fortress] - 213 - Badge Vendor (25 Emblem of Valor)
Trinkets:
[Valor Medal of the First War] - Badge Vendor (40 Emblem of Heroism)
Idols:
[Idol of Terror] - Outlands heroics badge - remains the only avoidance-oriented idol for bear tanks
Weapons:
[Staff of Trickery] - Cyanigosa in Violet Hold (heroic)
[Stave of Shrouded Mysteries] - Kirin Tor rep (revered)
[Witch Doctor's Wildstaff] - Slad'an, Gundrak (normal)
[Staff of the Sorrowful Chieftain] - Wanted: Ragemane's Flipper (quest reward, Zul'drak)