The next episode of Halo 4's Spartan Ops launches early next week, and will center around the appearance of the Sangheili terrorist known as "The Didact's Hand" on the planet Requiem.
As shown in the trailer for Episode 4 above, in addition to the unexpected visitor, the team is contacted by an unknown intelligent form while searching for an A.I. program previously encountered by Master Chief. Halsey, however, seems to know a thing or two about what this being may be.
Spartan Ops Episode 4 launches on Nov. 26.