During the Halo: Nightfall panel at San Diego Comic Con, 343 Industries officially revealed that Agent Jameson Locke will be a playable character in Halo 5: Guardians. Gamers will begin their journey playing as Agent Locke come Halo 5’s release in November this year. Halo: Nightfall is expected to be tied in more closely to Halo 5: Guardians than Forward Unto Dawn was for Halo 4.
Source: IGN