What are the new features of Drupal 9?

Drupal 9.0 has the same features Drupal 8.9 (other than those provided by updated dependencies). Similar to Drupal 8, Drupal 9.1, 9.2, etc. will add new backwards-compatible features to Drupal 9 every six months after Drupal 9.0. The key benefit of Drupal 9 over Drupal 8 is the platform will be supported with security fixes after November 2021. The standout feature of Drupal 9 is its ability to provide as easy an upgrade as feasible from Drupal 8.

Drupal 9.1 onwards will continue adding new features to Drupal core. Project lead Dries Buytaert proposed a few tracks of possible future directions in his keynote at DrupalCon Amsterdam: