BS3 definitely does, I have a BS3 and a Sony Playstation 3. When I play a bluray movie on the playstation selecting the PCM sound track, on the BS3 in the sounds menu it tells me my sound source is multichannel PCM. If I switch the playstation track to dolby digital 5.1 the BS3 plays the dolby digital track as expected. But the main difference is in what you actually hear when the PCM track is playing, it is way better than dolby digital 5.1.
Cheers
Peter
My B&O - BS3, BV4-50, Beomedia 1, BS3200, DVD1, BL8000, BL6000, BL3, BL2, BL7.4