According to Angus' newsletter, there's meant to be a new PAM510 coming soon. Quoted directly from newsletter below:
PANERAI LUMINOR MARINA 8 DAYS SOON!
The ZF maker is currently working on a truly 1:1 PAM510 (not like the other versions modified from PAM111 case as the PAM510 case is completely different from the PAM111 case), and the movement will be REAL 8 DAYs power reserve, it will work for 200 hours before it needs to be wound again! Minimum ETA is 3 months!