Preview Multi-Factor Authentication Assistant behavior before you deploy it. URL redirects and OAuth 2.0 flows are more secure and efficient. You can now update users’ email addresses more easily and securely. HTTPS is required for Salesforce domains, and enhanced domains meet browser security requirements. Encrypt the User Email field (beta). Learn more about API version use with the new API Total Usage event type. Security Center now integrates with Threat Detection (beta). For sites, improve page load times with caching and update guest user licenses.
https://help.salesforce.com/s/articleView?id=release-notes.rn_security.htm&release=232&type=5