Hoax
Image 1:
http://gamecenter.globo.com/GameCenter2/foto/0,,3445754,00.jpg
Note that the TV sets where Halo2 runs and the boot Xbox360 image is shown are not the same. The CRT tubes are different.
Image 2:
http://gamecenter.globo.com/GameCenter2/foto/0,,3445756,00.jpg
The TV set that shows the boot logo is attached to a RF cable rather than the video cable seen in the other images. It can be seen by enhancing brightness of the image as shown. Also, the image quality is poor compared to the first image, showing more evidence of a RF feed probably coming from a VCR with the MTV Xbox360 debut recorded and played back.
Image 3:
http://gamecenter.globo.com/GameCenter2/foto/0,,3445758,00.jpg
The cables attached run behind the pillows before coming out to the TV. That's why the pillow seems to have something under it: an old Xbox runnig Halo2. The boy does not sit on the pillow to avoid crashing the console. The Xbox360, despite the fact that it is suposed to be running Halo2, is turned off.
What is it then? An E3 stand mockup, with the cables coming out of the console used to light up the front logo and wave green effect into the button, used in the Microsoft stand. They were attached in a "flower" arrange in some glass showcases around the stand.
The full story (portuguese):
http://gamecenter.globo.com/GameCenter2/0,,GMM0-3797-0-5618,00.html
I just copied and pasted this from another forum that proved this was fake