There are changes that require a new edition, particularly around new keywords.
However, to be clear, editions are primarily a marketing/communication/project management tool. They give us a way to try to bring together a number of threads of work into a coherent whole, with a high level of polish across the board (including docs and tooling), and then to present that work to the world with a clear story.
It's worth comparing this to the recent Firefox Quantum release, which was likewise a singled out release on the normal train process that brought together a number of important changes, marketing/communication, and a high level of polish.
However, to be clear, editions are primarily a marketing/communication/project management tool. They give us a way to try to bring together a number of threads of work into a coherent whole, with a high level of polish across the board (including docs and tooling), and then to present that work to the world with a clear story.
It's worth comparing this to the recent Firefox Quantum release, which was likewise a singled out release on the normal train process that brought together a number of important changes, marketing/communication, and a high level of polish.