The new release candidate brings Drupal 9 readiness and further contains some fixes and refactoring. If SOFORT Überweisung is used, it is strongly recommended to update from rc8 or rc9, as SOFORT plugin was ignored by cron tasks, since we have introduced the dedicated plugin class for it in rc8.
The cron processing of pending authorization has become more bulletproof, as now the transaction report queries are used instead of the checkout ID queries.