I still think that you must let the player decode the HD signals and send multichannel PCM to BS3.
I have a BV7-55 MK1 with BR, and I just started Transformers 3. I selected DD TrueHD as audio, and in the TV it says:
Inputformat: PCM 7.1
Outputformat: Multichannel Speaker 5
I think the main thing for the BS3 (now) is to be able to decode DD for i.e. HD TV signals. Here is where we still need the BS3 to make decoding, The new V1 does not support that much (yet) regarding decoding formats. And I am not sure it ever will.