Just got this response to my questions directly from Freemantle
Hi there
The early editions of Prisoner that were released in the digipacks with slipcase will be replaced with the plastic case versions when current stocks of the digipack packaging runs out to match the later volumes.
With regards to release dates, I can confirm that we now have Volume 14 scheduled for release 9th July 2012 and Volume 15 on the 8th August, we hope to release volumes monthly going forward after that.
so 2 confirmed releases then a release every month
