Currently web developers can embed specific widgets within a fragment. Marketers can choose the configuration of those widgets, however they cannot choose to add additional widgets.
The goal of this improvement is to allow Marketers to choose any widget and add it to the page. They will be able to drop Widgets to fragments created inline within the page.
This feature, together with the previous ones will allow Content Pages to cover almost all use cases than Widget Pages, while providing more flexibility and ease of use.