Adaptive sampling was shown as working in the viewport in Blender today, was this a mistake?

Is it supposed to work in the viewport? Only works in final render for me.

Have not seen that part of the show but adaptive sampling is only for final render. To what i remember is that he rendered a normal image and explaining that the background needs less samples than the forground.

Cool, thanks. I wonder what the drawback of having it in the viewport was, seems like it would speed up viewport responsiveness during interactive rendering.