I believe Photoshop CC 2015.5 represents the most significant update for photographers since the launch of Photoshop CC back in 2013.
One of the big changes is to the old Refine Mask / Refine Edge dialog which has been completely replaced with the Select and Mask workspace.
With these significant changes I have updated two composite workflow movies that are featured in the Composite Projects chapter in my Photoshop CC Essential Skills book published by Focal Press.
These movies can be viewed below. Each movie represents a slightly different approach as no one approach can be relied on to guarantee a successful outcome.