Another article by digitoday (in Finnish) http://www.digitoday.fi/mobiili/2016...in/20166599/66

The C in the name stands for community. At first it was D as a developer but Jolla decided to change it to C because of wider user base than just developers.

Edit: there was also a little note about the turing phone:

-it wasn't allowed to take pictures of it
-the screen is about 5" or a bit bigger
-it has rough edges (just a pre-production model)
-fingerprint sensor is on the side
-the phone colours are mainly red and white