http://uk.gamespot.com/video/926632/6178833/halo-3-official-movie-9
There are others to watch as well
I think these are really cool, any firefly and space above and beyond fan can get the feel and even snips of these latest 3 videos and the ones before you can get the sense that a Halo movie would actually really work if it focused on the battle for the Earth and the outnumbered aspect
And as for the model they ACTUALLY made and apparently in the front lobby of bungie right now - WOW, great work on that, very cool