No new features have been introduced in this update, only updates to various packages.
MTA TLS engine change
The MTA TLS engine has been switched from OpenSSL to GnuTLS. If you have customized your exim salt module you need to update the configuration template files in your customized salt module otherwise your MTA will not startup and the baruwa-setup process may return an error during upgrade.
ERROR with rpm_check_debug vs depsolve:’, ‘libhogweed.so.2()(64bit) is needed by (installed) gnutls-3.3.25-1.el6.x86_64’
The above issue can be fixed by running the following command:
yum erase gnutls