You can now learn new features of the app right from within the app:
How do you learn what the new features are and how to use them? The answer is the Photoshop CC Features panel where you can access new tools and features and watch videos all within Photoshop CC.
To get the panel, launch Photoshop CC and then open the Adobe Exchange Panel by going to Window > Extensions > Adobe Exchange. You may need to restart PS in order to apply updates.
If you’d like to make a panel like this for your organization (e.g. to train freelancers on your processes & systems), grab Adobe Configurator 4.0.