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The most critical requirement for Drupal 10 is our CKEditor 5 integration. CKEditor 4 is end-of-life at the end of 2023, so Drupal 10 must use CKEditor 5 instead.
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Releasing 10.0.0 in December instead of August gives us more time to stabilize CKEditor. It also means more time for site owners to test moving their content from CKEditor 4 to CKEditor 5 in Drupal 9, so that we can ensure a smooth and safe upgrade path for this major change.