HDMI 1.3 allows the audio processing of True-HD and DTS-MA to be done via a receiver rather than the player itself. Currently the XA2 and PS3 process all audio on board and then pass the audio as PCM to the receiver. This new Onkyo will be the first that will allow the XA2 or PS3 to pass the audio as bitstream to the receiver, from there the receiver will decode the audio and play it so:
XA2 and PS3 currently passes TrueHD and DTS-MA, the player does the processing, as PCM to receivers
with new 1.3 HDMI receivers
XA2 and PS3 can pass TrueHD and DTS-MA as Bitstream for the receiver to do the processing
The question is will the XA2 and PS3 pass the bitstream of DTS-MA...currently it is unknown and the speculation is a firmware update is needed to provide this ability, reason why all the PS3 owners are wanting this badly...