"Turn it into a skin"?
OS4 does not support "skins"
What it does support is "themes" of icons, colours and gadgets and bitmaps.
If it was "skins" then different skins would be able to place the gadgets on different locations, replace entire GUI layouts and so forth.
Also, the scope of this concept picture goes beyond the "look", and I doubt that was done unintentionally. It shows functionality that should very well be avaible. Applets for the the screen bar, status bar in a WB window and the output renderer for the shell (well, OS4 _does_ have an xml parser buildt in now, right? Why not put it to use? :-D )