Please take a moment to sample the video above. Now, let that sink in. What you have just witnessed is the work of the newly chosen director of (drumroll please) Halo. That's right ladies and germs, the mystery has been put to rest. It's not Guillermo. It's not Peter Jackson himself. It's a relatively unknown South African (did you hear that Ludwig?) director by the name of Neill Blomkamp. Though Blomkamp's resume consists mostly of short films and commercials, his work has garnered him many awards (including 3 Clios and a Visual Effects Society Award). Also, the Halo movie has been pushed back to 2008, ending any speculation that it would launch day and date with Halo 3.
Choosing a little known director whose work has been primarily in commercials and short films is an interesting choice. Then again, Jackson himself started out making campy horror films (so did Sam Raimi of Spider-Man fame) so, who's to say?