A new type of actors has been added. Now you can define that the actors of a step, are the ones who approved a previous step.
For that the variable has to be used. In that variable you now have an additional definition:
Actors (definition): contains all actors linked to a step
Actors Executors – All: contains all actors who approved a step
Actors Executor – Last One: contains the last actor who approved the step before continuing the workflow
The same logic also applies in email templates.