we STILL don't have an official list from Apple of what they changed. https://developer.apple.com/mac/library/releasenotes/MacOSX/WhatsNewInOSX/WhatsNewInOSX.h

we STILL don't have an official list from Apple of what they changed. https://developer.apple.com/mac/library/releasenotes/MacOSX/WhatsNewInOSX/WhatsNewInOSX.html https://developer.apple.com/mac/library/releasenotes/MacOSX/... This document is not intended as a complete list of features or changes for each new version of Mac OS X. Instead, it focuses on those features or changes that affect the development of third-party software, providing overviews of each along with insight as to how and when you might use them to create your own software. Wherever possible, this document also provides links to other Apple conceptual and reference documentation for that feature or change. You will need a free Apple Developer Connection account to read it, and the rest of the updated developer documentation.