While I haven't been watching development lately, Epochtalk isn't Bitcointalk. Epochtalk is the generic name for the new forum software Bitcointalk commissioned. For an apt comparison, Epochtalk is like Default SMF. Once the work is done creating the backbone, Bitcointalk will be built onto it. What you are seeing there is the default that anyone will be able to take and customize to make their own forum. The orange isn't a theme, its just a placeholder. Styling work will be done last or near last.