Eh if it costs "nothing" (I doubt it'll be entirely free, but 10-20 rage) but likely heal you for quite a bit, you should probably be very okay with being "forced" to use maul
And it's the very first version of the tier bonuses and they'll surely be changed at least three more times, with a decent chance of being reworked entirely, not much reason to discuss it at this time.
Also wow, these new tank trinkets look nice:
http://ptr.wowhead.com/item=151974/e...onus=3610:1472
http://ptr.wowhead.com/item=152645/e...onus=3610:1472
Possibly can be switched in combat, armor for physical, versatility for magic damage spikes?