Adobe's new Dehaze feature announced with the release of Photoshop CC 2015 and Lightroom CC 2015 will not be available to Lightroom 6 users. However, those Lightroom 6 users are not out of luck.
Prolost is offering a free Dehaze plugin for Lightroom 6.1.
From Prolost:
Dehaze for Lightroom 6.1DownloadA series of presets that give you intuitive, visual access to the new Dehaze control added in Lightroom 2015.1, without requiring a Creative Cloud subscription.