Brian Collins is a developer over on Blackberry News. He is still designing themes with the 4.7 Plazmic themebuilder.
I come across people saying 4.7 themes work flawlessly on their phones but it's definitely not the case for mine. My favorite theme shows white sides in landscape mode and glitches during scrolling. None of the so called fixes change a thing for me. There is one that calls for changing the layout and reverting back. Don't waste your time. It does not work.
Themes will be available in droves when the new Plazmic themebuilder is released for 5.0