In the same way as you can currently render the active viewport in Open GL? Some aspects of the Workbench renderer look as if they will be very useful for NPR people.
In Blender 2.80 the workbench engine can be used as an interactive viewport renderer, viewport rendering (to image or animation) or final render (image or animation.
Workbench is used when the viewport is in
In the view menu there are two operations. One for
Viewport Render Image and one for
Viewport Render Animation it will use the same settings as your current viewport.
Workbench as render engine
In the Properties panel it is possible to set the render engine to
Workbench. Now when you do a final rendering it will use the workbench engine.