But that's the point (I'm not arguing about the capabilities of the PS3, I know it's a good BD player), but streaming a signal via HDMI requires that you have a receiver capable of decoding that stream. No different from having a slightly lower spec BD player with a receiver capable of decoding the DTS signal.
Fair enough, but most Bluray players would also need to stream to a receiver?
Also, the format it streams in is quite common on newer receivers.