You should be taking both Stampede (at least 1 point) and Blood in the Water (2 points) if you plan on taking advantage of cat form (Hint: You should) and want to utilize the cat portion of your Tier 13 bonuses.
Ideal candidates for moving points out of (ranked approximately in order of usefulness, least to most):
Brutal Impact, Feral Aggression, Infected Wounds, Fury Swipes
Note that you must have someone else applying the attack speed debuff to whatever you're tanking if you want to take points out of Infected Wounds. Most of the time this would be your other tank or any sort of DK. Also worth noting that you should never take 1/2 Infected Wounds.
This is the talent spec I would tend to use for any encounter where I'm
Bearcatting (all of them unless I'm tanking the 1 tank fights, and even then there's still room to go cat a lot of times, but there's some personal preference on if you want to bother), and this is the spec I would use for
pure tanking. Notice the glyphs are different.
Wrath of Unchaining is incredibly strong; you probably want to use it on every encounter. The "stam on magic fights, agi on physical fights" bit has some truth to it, but it doesn't really work out that way on every Dragon Soul encounter. Indomitable Pride's strength is mostly in situations where you're expecting spike physical damage, such as Amalg Tank on Spine (you should be using the Mirror from Baradin Hold rep for spike magical damage). Vial isn't particularly amazing for progression as a bear. You'd want to use it if survivability isn't much of a concern for a particular encounter and/or DPS is a concern (Ultraxion or farm content). I'm not really a fan of Soulshifter Vortex myself, although it is one of the easiest to access trinkets in regards to heroic drops so it's got that going for itself. As mentioned, the Mirror is very potent on heavy magic encounters and I'd highly recommend picking one up.
For reforges, stat priority is Dodge > Mastery > Crit = Exp (to 26) > Hit = Exp (past 26) > Haste.
If you plan on doing a lot of tanking and not much shredding faces, then reforging your worst stat to dodge is the way to go. For a DPS heavy tanking style, you can follow the reforge priority listed above, but ignoring dodge. This will yield fairly comparable survivability but increased damage in cat form.