In this release:

• Security improvements. We recommend updating.
• Fix: a formula with Load macro dynamically showed "Some error occurred while calling Math servlet" (or stayed at "Fetching...") instead of its result. On Confluence 10.x such formulas load asynchronously again, also for anonymous visitors on sites with anonymous access; on Confluence 9.x they are calculated when the page is displayed.
• Pages can be migrated to Confluence Cloud with the Confluence Cloud Migration Assistant - see Migrating from Data Center to Cloud.