They did. It's called RTM because they Released it To Manufacturing. The manufacturers now have the bits. They will use it for their firmware updates and testing to be sure that everything works in their phones, updating firmware and their own software as needed. Then carriers will get it. They will make whatever updates to their software that may be needed. They will test, and finally they will release to their customers - us. That's how it works. As far as Microsoft is concerned, the build that was sent to the manufacturers, the same build that we now have, is intended to be the final build, and that will only change if they need to put out bug fixes. Otherwise, it is finished.