I don't see any other mock-ups or screenshots there, that kind of leads me to believe this was the possible working 'goal' for the developers, not just a brainstorm.
It's inappropriate to make public accusations based on assumptions. Fortunately, one doesn't need to operate based solely on assumption, since asking for clarification is easy.
The linked article has been updated: the MetaLab and Mozilla guys have now spoken on the phone. The material was used in both the launch announcement and video for the product, but the design has since been changed. Mozilla have apologised. A follow-up post from MetaLab is promised for tomorrow.
