DPIA and PIA Guidelines
There are various projects to create Guidelines for Data Protection Impact Assessments and Privacy Impact Assessments.
CNIL PIA Guide
The CNIL is the French Data Protection Authority (DPA).
In June 2012, the CNIL published a guide on privacy risk management, applicable to complex processings or high risks scenarios. It helped data controllers to get an objective understanding of the risks arising from their processings, in order to select the necessary and sufficient security controls.
This guide was updated in July 2015 to remain in line with the European Data Protection Regulation project and the WP29’s work on the risk based approach. It also considers feedbacks and improvements proposed by different interested parties on privacy impact assessments guidelines. Three documents are available:
Manual 1: PIA Methodology (how to carry out a PIA) Manual 2: Tools (templates and knowledge bases) Manual 3: Good Practices
ULD PIA Guide
The "Unabhängige Landeszentrum für Datenschutz" prestened a guide to DPIA's according to the GDPR at the annual privacy forum. So far they have not been published online to my knowledge but are part of the APF booklet.