Sorry, your question had scrolled off the chat while I did a quick search. I wasn't able to find any numbers as to additional rage from unbridled wrath. If you're looking at it from a tanking perspective for more rage, rage isn't really as much of an issue while tanking anymore. I dumped the rage gain talents I had back in 3.0 (Anger Management and Imp Bloodrage) and I still find myself capped at 100 rage on boss fights. If you're having rage problems on trash and aren't having survivability problems, just pull more trash. Thunderclap and Shockwave make it so we can hold as many trash as we can survive, and doing so will speed up runs a ton.