I was farming Act 1 as usual in public play, doing Warden/Butcher runs, and starting to get a little frustrated by the quantity and quality of drops. Then I joined a game that had just completed the Skeleton King and was just wandering around doing all the events and side dungeons, and between the elites and champ packs we were seeing tons of yellows drop once we hit 5 NV (Resplendent Chest drops were awful, though). It's almost as if they nerfed the spawn rates in boss dungeons, but not side ones.
This, though, is based off of an extensive sample size of one play session.
Is anyone else seeing something similar? Or was this just a single fluky session?