My main concern with this is that it still requires special clothing to make the buttons respond to touch. Currently, if you have your iPhone in your jeans pocket, you can easily feel the physical volume buttons and adjust the volume without taking the iPhone out. However, with the capacitive surface button technology, you would need clothing made of materials that allow an electric current to pass through, which is not common in most clothing. As such, the usability of these buttons could be limited in many instances compared to what we have now. Therefore, unless this technology can be improved to work without the need for specialized clothing, I'm quite certain it will going to frustrate many users who consider it a setback.