Earth

The only plot points that have been revealed so far are that Master Chief is back on a thoroughly conquered and Covenant controlled Earth. Cortana is still a prisoner of Gravemind, and Covenant ships are hovering over an excavation site only a few miles from the ruins of New Mombasa. Elites have left the Covenant and are waging a war of insurgency,although whether they have made an alliance with Human forces or not remains unconfirmed. Grunts have so far only been shown fighting alongside Brutes, and the alliance of other races is as yet unconfirmed