Following on Karthis' look at 2.4 badge of justice gear and the awfully wordy WoWinsider look, I looked into how the new gear figures vis-a-vis Emmerald's high gear mitigation tank points calculation. You can see the resulting spreadsheet.
Bottom line? The new stuff is very very good for bear survival. The Ring of the Stalwart Protector is the best ring in the game and cheap at 60 badges. The Tameless Breeches are the best pants available, another 100 badges. The chest and gloves are better than anything but T6, and the new DPS weapon is an impressive upgrade over Earthwarden for tanking. All in all you can gear up most of a post-T5 tanking druid without ever having left heroic dungeons.
In addition to being good survival gear, a lot of this stuff has lots of DPS from strength, attack power, haste. The one drawback is none of the new gear contains any +defense, so crit immunity becomes a challenge if you use too much of it.
Note, this data is still from the PTRs and could change.