...

3.       Actions: Actions are automated work steps that the system can perform and there can be more than one action in the workflow. Actions that can be taken range from publishing or unpublishing assets to setting access rights and executing searches.

More information can be found here.

Groups in groups

...

With this feature user groups can now be members of other user groups. The right managament becomes faster and easier, as a set of roles can now be assigned only once instead of individually for each subgroup of users.

...