In reply to Jeff Chandler.

"theme customizer now becoming the customizer" — In terms of word choice, this is simply a small shift in what we call/consider things internally and during development. There is incremental work to generalize and improve the APIs, but I wouldn't read too much into the diction here. There will always be experiments but I wouldn't expect anything drastic as a core project anytime soon.

As for the front-end editor, it is a cool experiment but it isn't there yet as a fully flushed-out user experience. Not only is there a Google Summer of Code project, but as part of 4.0, we're bringing in a number of lessons learned there, including embed previews in the editor, and the seamless editor scrolling. There's always something in the hopper.