Bungie's revealed it plans to publish a behind-the-scenes style Halo 3 documentary that "shows the process and people involved" in whipping that E3 trailer into shape.
Considering the documentary's subject matter and the fact that it's described as a "short", don't expect any super massive major revelations although the developer has said there'll be "never before seen scenes (think angles, really) from the trailer". Ooh...
Apparently,the documentary was supposed to be a nice surprise, but Halo music composer Marty O'Donnell pretty much let the cat out the bag leading Bungie to confirm that it's on its way at the end of last week.
Bungie's not given a release date for the documentary so far, merely saying it's "upcoming" - so for now, all we can say is: keep 'em peeled.