There is at least one video out there of Judge describing the changes he made. And I think one where A-Rod breaks it down, too.
One thing not in the GIF here (that may or may not matter) is he totally changed his stride/leg kick. This falls under style for most, but I do think changes to "style" can affect individual hitters differently, so it may be worth noting.
This might be subtle, but I think there is some early unloading of the back hip/leg. I heard him say that Holiday talked with him about coiling into the rear hip. I think he doesn't unload to early in the newer clip.