Hi Onno - thanks for bringing my attention to this post.
At this time, we do NOT have any plans for NPrinting Certification.
If this changes, I will be sure to share the news in Qlik Community. For information about our certifications, please visit these pages:
QlikView Certification: http://www.qlik.com/us/services/training/qlikview-certification
Qlik Sense Certification: http://www.qlik.com/us/services/training/qlik-sense-certification