According to Gameinformer, Halo: Nightfall, the live action Halo webseries will be available on Blu-ray and DVD on March 17th.
Halo: Nightfall follows the story of Agent Locke, a playable character in the upcoming Halo 5: Guardians. The webseries also serves as a story bridge between Halo 4 and Halo 5.
Both the Blu-ray and the DVD version will come with an additional 35 minutes of behind the scenes content. Furthermore, the Blu-ray version, which will retail for $24.99 will include 45 minutes of bonus content. As for the DVD version, it will retail for $20.99 and include 17 minutes of additional content.