Perhaps you've heard about the new Holy Paladin talent Aura Mastery. If not, here's the basics: to get it, you need to drop 11 points in the Holy tree. For your investment, you receive a new skill which will, for ten seconds every two minutes, cause your Concentration Aura to make all affected targets immune to silence and interrupt effects and improve the effect of all other auras by 100%.
And though everyone tends to stop reading and gape for a moment when they hit the part about "immune to silence and interrupt," keep reading. That's right boys and girls, it will also double the effect of any aura you have up for its 10 second duration. Devotion Aura? Check! Retribution Aura? Check! Fire Resistance Aura? Frost Resistance Aura? Shadow Resistance Aura? Check, check, and check! Crusader Aura? Double-check! If you take a look at the video above, you can see Aura Mastery and Crusader Aura in action as two Paladins with Crusader Aura up race out on the Shimmering Flats racetrack. (That flash of light is Aura Mastery being aactivated.)
So who's going to be grabbing this talent? Though silence and interrupt immunity would certainly have its occasional uses in PvE, this seems more of a PvP talent, where getting silenced or interrupted could mean game over. Ten seconds of boosted armor, resistances, or reflective damage doesn't seem that overwhelming (note that in the current PTR build, Aura Mastery's bonus is not changed by any other Aura-effecting talents) -- they're all very situational, but I can imagine situations when each could be useful. (Boss about to enrage? Some extra armor for the tank couldn't hurt. Is that fire Mage sending something evil your way? Boost your resistance to 260 for ten seconds.) For the cost of just one talent point, this seems hard to say no to, because situationally useful or not, in the situations in which it's useful, it's going to be very useful. (And, if nothing else, it's not a bad filler point.)