There are new features:

• scm plugin now supports DistGit (or DistSVN etc.) .
• log files of package_state plugin got .log extension. I.e. available_pkgs.log and installed_pkgs.log.
• Configuration files for Fedora 26 has been added.
• Configuration files for Fedora 23 has been removed.
• Even rawhide configs now use best=1.
• when Mock is run directly without consolehelper it now return exit code 2.
• You can pass additional arguments to systemd-nspawn using this config option: config_opts['nspawn_args'] = [].
• kojipkgs urls now use https instead of http.
• new plugin hw_info which prints HW information of builder. This plugin is enabled by default.

There are some bugfixes:

• reflect change of “Rawhide” to “rawhide” in /etc/os-release RHBZ#1409735
• in site-defaults.cfg is more examples of how to set up PS1 RHBZ#1183733
• preserve mode of files when doing chroot_scan RHBZ#1297430
• shell in systemd-nspawn is run as PID 2 RHBZ#1372234 - this is not done in EL7 version of systemd-nspawn does not support it
• debuginfo repos has been renamed so mock --dnf-cmd debuginfo-install PACKAGE works now RHBZ#1409734

Notes:

• next version will have systemd-nspawn as default. This can break your scripts built on top of Mock. You can try the new behaviour using --new-chroot option.
• next version will not be released for EL6. You are advised to upgrade to EL7.