By now you've realized this isn't yesterdays Dijit. The whole app has been given quite a face lift. The new design is, to say the least, much brighter than before thanks to the light gray background and orange highlights. Quite a departure from the darker look of the old version.
While the new look is certainly more attractive, I hope both themes are provided, as staring at this after being in the dark for a while could be eyeball searing.