Widget Manager
Introduction
Look out for this icon for the Widget Manager app.

You can find it in the appbar as shown below.

Click on this icon to launch the Widget Manager app. The Widget Manager app will open, and default tab is the Home
tab, as in the image below.

In the Widget Manager app, there is a sidebar menu with the following icons.

The icons mean the following (L to R):
Widget Store
The Widget Store is a store of multiple widgets that can used in Dashboards and other apps. This feature is work in progress, and will be released in a future version.
My Widgets
Under My Widgets you have the widgets which you have downloaded from the Widget Store for your use. This feature is work in progress, and will be released in a future version.
Editor
Here you can edit existing widgets and (possibly) create new ones. This feature is work in progress, and will be released in a future version.