This will be possible once a public API becomes available, but this will take some time.
If it's only some icons and colors, you may also try and browse through the .css files in the webviewer's folder (ce.lib project in the CE Workspace). Note there's no tech support available for this mission .. ;)
sorry, I cannot share a release date. it'll take some time.
but once out, I know you guys will go crazy. :)