Gracias Ade, se me había pasado ese hilo. He leido un poco por encima y en la primera página alguien comenta lo siguiente:

Although the audio is a secondary issue for me, I was dissapointed by the lack of configuration available to the signal coming out of the analog outputs. There is no bass management, can't adjust it to a system with no subwoofer and can't set the channel delays. That means you really need a receiver/processor to handle the sound, so even if there is an upgrade to decode the advanced audio codecs it won't be that useful. I would settle for an upgrade to output the new audio codecs through hdmi and let a processor decode them. I can't believe they didn't include that capability in the first place.
Luego acabaré de leer el hilo completo, pero parece que se confirma que es así y no decodifica los formatos extendidos.