Scenes of distant mountains with no haze help make landscape images by Ansel Adams and other master photographers of his time and before him so attractive. That's partly because we experience so much more haze throughout the world now than the earlier photographers experienced. The haze not only partly obscures the distant scenery but also reduces the contrast and dynamic range.
I have specific post-processing techniques that reduce or eliminate haze but I have no way to accomplish the dramatic results displayed in this demonstration of the new Dehaze Slider that is only in Lightroom CC and ACR CC. The slider works incredibly well in the city scene. If it works equally well when eliminating haze in distant landscapes, that would be reason enough by itself for me to subscribe to Adobe's CC program.