GameSpot
The Xbox One's HDMI pass-through port will support "any HDMI device", including the PlayStation 4, Microsoft confirmed during its presentation at the Tokyo Game Show.
During the presentation, Xbox senior director of product management and planning Albert Panello received a question regarding the Xbox One's ability to support video feed from the PlayStation 4, which he did not respond to directly.
Later in the presentation, when Panello discussed the Xbox One's ability to snap applications to the side of the screen during gameplay, he said "any application can be snapped to a game…this could be the live TV feed, so if you wanted to be playing Ryse and Killzone at the same time, you could snap that."
http://uk.gamespot.com/tgs/playstation-4-will-work-with-xbox-ones-hdmi-pass-through-port-6414735/
