We've spent some time working on and reviewing the new Adobe Lightroom Classic CC.
Here are some of the biggest changes according to Adobe:
Application launch time
Preview generation
Import selection workflow with “Embedded & Sidecar” preview option Switching between Library and Develop Module
Moving from photo to photo in the Develop Module
Responsive brushing
"We have also added new tools to make precise color and tone-based selections for local adjustments. You can now use the adjustment brush, radial, or graduated filters to define a rough mask, then refine the selection via the new range masking options found at the bottom of each local adjustment panel. This serves as a nice complement to meet your masking needs with the already existing auto mask feature in place."
You can see more over at http://www.thephoblographer.com