As announced on the mailing list, OpenAM 10.0.1 is now available. This is a maintenance release that brings important fixes, so be sure to update your OpenAM 10.0.0 installations.
You can get OpenAM 10.0.1 from the OpenAM download page under Latest stable releases.
OpenAM 10.0.1 brings you over 48 bug fixes, including important security fixes, and 6 enhancements. For details, see the release notes.