Machinima finally put out the trailer for Halo Xbox One, I believe they never put it up until now since they finally got their hands on an actual version of the trailer, not one ripped from the live press conference.
Here it is: http://www.youtube.com/watch?v=gb9RgznMQIY
The sounds are much better in high quality, including the music where Chief pulls out the chip.
You could probably see more close up details in this version but other than those few things, it looks really great in 720p.