Originally Posted by ThumperII
Why would 4k and HD require separate HDMI outs? The PS4 decides on the output and the connector just transmits whatever is given to it. The new HDMI spec should be able to transmit 4k on down to 480i.
If you have a 4K tv (the only reason the PS4 would be outputting a signal in 4K) and you don't have a receiver with 4K pass-through, you could run the 4K video direct to the TV, and just the audio over the other HDMI to the receiver. Just like many 3D blu-ray players (oppo BDP-103 for example) do today. This removes one more barrier to buying a 4K TV, as if you just bought a really high end receiver in 2011, you wouldn't have to upgrade it. Sony frequently takes a long-term view of these things and is probably hoping that the ability of the PS4 to output both really high quality 3D, and some type of 4K content will entice people to buy some of their TV's, either 3D or 4K. The extra port would allow non-3D receivers to be bypassed as well.