Halo Live Action Movie

Fans are earning for a live-action Halo movie since quite a long. If you're not familiar with Halo, well, it's a popular science fiction first-person shooter video game franchise created by Bungie and owned and published by Microsoft (a real hit on XBOX!). The game is based on great story, so no wonder that there have been talk of making a live action movie based on Halo.

Plot:
"Thanks to the realization of faster-than-light travel Mankind has started to colonize new worlds. Things go well for a while, but then a technologically advanced collective of alien races, the Covenant, began to attack human settlements, declaring humanity an affront to their gods. Mankind is under threat of total annihilation.
But an elite team of bio-engineered soldiers stumbles upon Halo.A, an enormous, ring-shaped artificial space habitat/planet. This discovery may well change the fate of Mankind!"

Unfortunately, the movie is not in development yet. Microsoft's execs are probably wary that if the movie doesn't perform well it would negatively impact the game franchise. But this doesn't hinder the online community to speculate and rumors about the potential Halo movie to flourish.

There is hope though! For the release of Halo 3, Microsoft hired Rupert Sanders to direct a live-action trailer to promote the game. And the result was damn awesome:

HALO TRAILER
Let's hope that the live-action Halo movie we all want to see will be greenlit soon! Anyway, any suggestion regarding the live-action movie Halo movie? Any cast to recommend or any plot detail to suggest?
:)