probability of mis-matched images seems like it would be incredibly high
It would still be quite useful if the sketch narrowed the options to a list. Traditional point-n-click could refine/revise from there.
This innovation seems to be a shortcut mechanism based on pictographic gestures, where they also take the position, relative size into account. This is very nifty.
I cannot see how this would be faster than traditional Illustrator/Indesign workflows of selecting the elements from dropdowns, dragging to correct location and dragging the handles. If you use their sketching method, you are probably going to have to fall back to 2D drag'n'size methods post generation
However, I wonder about this technology being used for evil (custom porn). =/