Things seen at IBC 2015 #1:

Here’s a sneak peek at Sony’s GEN2 ODA drive prototype. This optical archive format uses a cartridge containing a stack of 12 Blu-ray discs.

The volume is UDF-compatible and I was told the discs  inside the cartridge could be read individually as data Blu-ray discs if the standard disappears: to be tested! For the current 1.5TB Gen1 Expect +/-$7000 for the desk version of the drive (USB3) and $70 for blank media.