Alex Garland ("28 Days Later") wrote the script and will be working on tweaking it after Universal hires a director (Fox will be handling the foreign distribution).
Microsoft, the maker of "Halo" the game, will be heavily involved in the production of the film. In fact, Microsoft commissioned the script and had very specific demands when it sent the proposal out to studios, including creative control and a quick turnaround time for production to begin once the deal was finalized.
SOURCE: Variety

