@Donna Fontenot -
Love the idea of widget previews, but why limit it to the theme customizer area?
This is the same question I have. Wouldn't we have to explain to users that if they want to see live previews of widgets, use the customizer. For everything else, use the regular Widget administration page. Seems like a layer of confusion. Wouldn't it be better to have live previews on the widget admin page versus the customizer?