You are right, there was a prototype display module! We should be releasing some addition widgets soon, so keep an eye out for displays.
Did you know you can see the values of the variables in realtime within the Crumble software? When you click the play button, switch to the variable tab in the toolbox to see them. They will update in realtime until the USB is disconnected (they will show as question marks when there is no link).
Hope this helps,