via make.wordpress.org => original post link
Lately I’ve been seeing more mentions and questions about “Core and Gutenberg”, “In Core or in Gutenberg”, “Core vs. Gutenberg”, “Merging Gutenberg”, “On Trac or on GitHub”, etc. I agree, the current WordPress development setup is somewhat complex. Two repositories, different release cycles, merging… This post won’t answer all questions, but hoping it will help to clarify some of them.
Core is Gutenberg and Gutenberg is Core
The code that is currently on WordPress.org Trac, and the code that is currently on GitHub are two parts of the same application. When a new version of WordPress is released, the code from both places is combined.