I will echo what Ghostcrawler says in his post: these changes will not be live with the Wrath of the Lich King launch on November 13th. That said, Blizzard wanted to make Druids aware of the changes so that you can choose quest rewards, dungeon drops, and reputation rewards in confidence that once this goes live it will be a competitive item to those that have bonus armor. There are also some big changes coming to reduce the cost of shapeshifting for Feral spec, and also a removal of the group member requirement for full benefit from Protector of the Pack.
Quote from: Ghostcrawler (Source)
We are changing the way bear armor works so that bonus armor on items does not receive the bear armor multiplier. Specifically this means that trinkets, rings, necks and cloaks with bonus armor will not be multiplied by the bear bonus. The normal armor on leather will still be multiplied by this bonus. We are also going to remove bonus armor from Feral staves. You’ll get your bonus armor from the leather you acquire.
1) A ring that grants 100 bonus armor will now grant a bear 100 armor (not ~470 armor).
2) Leather legs with 253 armor will still grant a bear ~1190 armor (not 253 armor).
3) A feral staff will now grant 0 armor.
We are making this change because armor is such a good stat for bears that it makes taking pieces with bonus armor a non-decision and we don’t want acquiring these pieces, which tend to not be common, to be so much of a barrier to a druid who wants to tank a raid.
This change will NOT be in effect when Lich King ships. We are letting you know this now so that you don’t go through heroic efforts to acquire items like the Badge of Tenacity, or Defender’s Code. Defender’s Code, with 850 armor, will still be a good trinket. But it won’t be an insanely good trinket for a bear.
We will adjust the bear armor modifiers so that your net mitigation does NOT go down with these changes. Let me repeat: this is not a nerf to Feral armor. It is a change to the amount of armor you get from gear with bonus armor.
We are adding an effect to a deep Feral talent (something like Primal Tenacity) to further reduce the cost of shapeshifting into cat or bear by 50%. This talent will stack with Natural Shapeshifter for a total cost reduction of 80%. PvP-focused druids can get both talents to shift easily and often despite, no longer having Int on gear at level 80.
PROTECTOR OF THE PACK
We are removing the group requirements from this talent. The new tooltip will say: “Increases your attack power by X and reduces the damage you take in Bear Form and Dire Bear Form by Y.” The values of X and Y themselves are not changing.
Again, these changes will NOT be in Nov 13 for Lich King’s launch. We will add them in a patch that will come out sometime before the major Ulduar content patch. We're letting you know now so that you can choose quest rewards and loot drops accordingly.