Computerworld - https://www.computerworld.com/article/3267978/apple-mac/mac-pro-2019-is-apple-planning-the-next-transition.html#tk.rss_all
Apple broke its silence today in order to reassure the Mac-buying public that it is indeed still working hard on developing the next Mac Pro – but we probably won’t see this unicorn beast reach the Apple Store until 2019.
The delays will continue until waiting is fashionable
Apple seems to be working very hard on the new Mac model. Development of the new Mac is very much centered around the needs of professional users – the company has even recruited some pro users to work with it in developing the new systems.