FAQ for Halo: Reach.

Does Master Chief appear in the film?
Yes, Master Chief appears more at the end of the film as an antagonist who brutally attacks Noble Six. Jacob Heyes was already closed in by Master Chief, Master Chief brutally knocked out Noble Six, but was attacked by a large artificial machine. After destroying the machine, Master Chief did a last attempt to beat Noble Six to death, but he was ultimately destroyed with the bazooka of Jacob Heyes, blowing him apart.

If Jacob Heyes was killed during the first film, how is it he is still alive in Halo: Reach?
Halo: Reach is a prequel to the first three films, so Heyes was alive during this film.

How does the film end?
En route to the Autumn's dry dock, Carter is critically wounded; he rams his ship into a Covenant mobile assault platform, allowing Six and Emile to reach the shipyard where the Autumn is located. Emile takes control of a coilgun emplacement to defend the Autumn while Six fights through Covenant forces to get Cortana to Captain Jacob Heyes. When Emile is slain by Elites, Six remains behind to take Emile's place at the gun to ensure the Autumn escapes.

Is there anything after the credits?
Yes.

The post-credits scene shows Noble Six's last stand against overwhelming Covenant forces. After sustaining heavy damage, Six leaves his or her shattered helmet on the ground and is overwhelmed. Over thirty years later, the helmet rests on the grassy plains of a now-rejuvenated Reach. A narration by Halsey eulogizes Noble Team's sacrifice, which ultimately enables humanity's victory over the Covenant.

Will there be a Halo 5 and 6?
Dillan, who directed Halo: Reach, officialy confirmed he will direct both Halo 5 and 6 with Bungie serving as an executive producer. Dillan also said that Halo: Reach until Halo 6 will be part of a new Halo trilogy.