So the question to @nathanletwory and @jeff is what magic is Cycles doing to make the preview so much better than standard OpenGL? And is there anything you can do to improve OpenGL?
Obviously the RenderedDisplay mode is superior in all but this one aspect. But for modelling transparent objects it would be great if it would show some color.
Please add color first, that’s more important than bump maps. I understand if it is desired for DavidE to add both at the same time, but if that is difficult then PLEASE add color. I am sure a lot of jewelry designers would love you for it too.