Alex: The BeoSystem 3 gives you an option to choose the sound source, either SPDif or HDMI.
I'm pretty sure it supports 'uncompressed' Dolby Digital, it sounds pretty outstanding with BlueRay DVDs, which have TrueHD encoded soundtracks I believe. Noticeably better than normal DVDs...
In order to access the new hi-def audio formats, you need to plug the PS3 into ann amp which accepts LPCM audio over HDMI (most new amps will do this). That's the main limitation - although you will still get dolby digital and DTS ONLY over the optical spdif output.
it seems no one knows? we have had one comment that said playstation 3 looked good and one with reference to the panasonic BD10 which does not get good reviews and is not a profile 1.1 player and therefore does not support the format.