Latif Kalifa added a comment to my ‘news’ post this morning that Materials released just after my posting. The version for the main viewer is now: 3.6.0-277516. See the official announcement here: Get the New Materials Viewer Today! Check out Torley’s new video about Materials.
Torley’s bear is the wrong color… for Torley.
There is a brief tutorial on using normal and specular maps in the video. More tutorials are here: