A recent blog post by Diablo IV's lead systems designer, David Kim, confirms that the game will support elective mode-style skill selection and will also feature Keyed Dungeons. Kim also detailed itemization, endgame progression, power sources, and concluded by urging the members of the community to get involved by sharing their ideas.
https://www.notebookcheck.net/Diablo-IV-confirmed-to-feature-elective-mode-skill-selection-and-Keyed-Dungeons.443338.0.html