ORCID Login flow is improved. Users logging in via ORCID can now merge their ORCID login with an existing DSpace login. They also can login via ORCID without sharing their email from ORCID to DSpace. See https://github.com/DSpace/DSpace/pull/9849
Request a Copy now supports sending a secure download link for larger files. Files under a (configurable) size threshold are still attached in requests. But, larger files now send a secure (auto-expiring) link to allow the requester to download the file. https://github.com/DSpace/dspace-angular/pull/3984
ALTCHA captcha protection is now supported. Currently, it's only used by Request a Copy.