Although the focus is currently on Apple's refreshed MacBook Air and entry-level 13-inch MacBook Pro, there was a subtle sign from Apple of where it is heading with its MacBook line up in 2020. The quiet demise of the 12-inch MacBook that came with the launch of the new MacBooks aligns nicely with rumors that Apple will introduce a new ARM-based MacBook next year.
https://www.notebookcheck.net/Death-of-12-inch-MacBook-points-to-ARM-based-replacement-for-2020.427200.0.html