Workflow Conditional Visibility is the new feature available from version 5.0.  Workflow Conditional Visibility is the ability to show or hide a workflow action that an be triggered by user with the appropriate privileges.  Workflow Conditional Visibility uses the core conditional evaluation engine available in other areas within Enterprise Forms. 

Configuring Workflow Conditional Visibility is available from the Workflow screen (accessible from Form Template Manager --> Form Details).  The section is located under the Conditional Settings section as shown below.

The above image shows the Workflow Action bar when the form is viewed in details.  The individual actiob buttons can now be shown/hidden using the Workflow Conditional Visibility feature.