So, I asked this before in Society Unchained blog, but apparently the question got trampled beneath one of those pesky arguments, and ended up ignored(?)
I had a question about whether Drunken Brute archetype is applicable to Unchained Barbarian or not. The above-mentioned blog post said that Unchained barbarian can take any archetypes which doesn't affect how rage works. I took it that this would forbid all those which specifically replace rage with alternative functions entirely. Drunken Brute doesn't do that, but instead adds a side mechanic to the default Rage ability.
Raging Drunk (Ex): While raging, the drunken brute can drink a potion, or a tankard of ale or similar quantity of alcohol, as a move action that does not provoke attacks of opportunity. A potion has its normal effect, while an alcoholic drink allows the barbarian to maintain her rage that round without expending a round of rage for the day (instead of the alcohol's normal effects). For each alcoholic drink consumed while raging, the barbarian is nauseated for 1 round when her rage expires, in addition to the normal fatigue that follows a rage. Tireless rage does not negate this nauseated condition but the internal fortitude rage power does. This ability replaces fast movement.
Given that Unchained Rage still requires rage rounds to be spent each round, it would seem that yes, you can take Drunken Brute, but the afore-mentioned restriction led me to wonder if not, after all. I'd like to know for sure.