There is a leak video from YouTube user, HaloReachVids46, that shows the armor and other Halo: Reach leaks. This person obviously has a copy of Halo: Reach, because he has several videos from the game. Watch at your own descretion, as obviously it could contain spoilers.
Bungie is trying to keep their forums under control with the recent leak, explaining to their members what a leak is and what is not accepted on the forums.
"Posting to discuss, request, or link to information or campaign spoilers from illegitimately obtained sources - including illegitimately obtained copies of Halo: Reach - before the game is officially released will be considered a leak and will be treated as such."
Now, the big question, how did Halo: Reach leak?
Normally it's through a review or a test copy. Microsoft had recently released a digital version online of Halo: Reach for access to reviewers. Game-Tuts seemed to have found a way to get around Microsoft's protection software and gain access to these codes. It also seems like the forum that discussed the leak, was taken down completely from Game-Tuts.
Some people say digital distribution is the way to fix piracy, I guess it's back to the drawing board.
One thing I'm excited for is that Microsoft usually drops the Ban Hammer around November, right after their main titles have dropped. Get ready for all the whining from those who chose the wrong way of doing things.
Here is a video of someone booting up Halo: Reach, using their Jtag Xbox 360.
