Since it's an iterative firmware I am assuming it will be free. I really look forward to this as HDR demand from my clients is growing. The big question for me will be how soon Odyssey implements it so that I can record 4K 12 Bit HLG. Mitch?
"The Sony PXW-FS5 and PXW-Z150 will receive the additional HDR capabilities via a software update. For the FS5, HLG will be supported, in addition to S-Log3. The HLG2 mode can be set-up quickly through the option of the newly added picture profile....PXW-FS5 software update V4.0 will be available in July, 2017."
https://www.sony.co.uk/pro/press/pr-sony-expands-hdr-production-capabilities
"The Sony PXW-FS5 and PXW-Z150 will receive the additional HDR capabilities via a software update. For the FS5, HLG will be supported, in addition to S-Log3. The HLG2 mode can be set-up quickly through the option of the newly added picture profile....PXW-FS5 software update V4.0 will be available in July, 2017."
https://www.sony.co.uk/pro/press/pr-sony-expands-hdr-production-capabilities