Ok I feel the need that I need to mention something quite important.
Nothing was "discovered", those pinout's were taken DIRECTLY (its a print screen from the docs!) from one of the Sony PS3 Service Manual's - Yes, the service manual identifies the JTAG for the BD Drive, as well as for the CELL, SYSCON, etc - quite useful if these items were not disabled at the factory.
Now a days - these things are blown at production, companies have learned that leaving JTAG's active can be a very, very, very, bad thing.
Its very old news - we tested these exact points (and others) nearly a year ago and got nowhere- they are blown!
Now, maybe if you had say, a PS3 TOOL, or a nice PROTOTYPE with active lines it would be something different