I have been following the various news on the XBox One and I am pretty excited by what its future holds. I think Build will be very interesting (here's hoping for an actual App store - getting a native Plex client would be awesome).
The one thing that I think is currently a big miss is the XBox 360 experience. Because the XBox One doesn't have backwards compatibility, one needs to have both devices. Well, that potentially means the need to keep around 2 Kinect devices which is a bit unwieldily.
So here is the "card" that I hope Microsoft hasn't shown. I would love to see the 360 daisy chain with the XBox One. I'd love to see that in fact they have two HDMI inputs but chose to keep one of them hidden for this unveiling. I could see one going to a cable box and the other plus a USB connection to the 360. Now you have a way for the XBox one to control the 360. The Kinect could even pass through from the XBox One to the 360 over the USB interface. Just a firmware update to the 360 and everything works. With the new 360 styling it even looks like it could fit as a daughter device.
I think that would be a killer maneuver.
Anyways, one can dream can't they?