Players who have already gained early access to Halo: Campaign Evolved have discovered two hints that Halo Studios (formerly 343 Industries) might be working on a Halo 2 remake.
The first reference can be seen after completing the campaign on the Legendary difficulty. In an additional final scene, Sergeant Johnson relaxes on a beach, observing the events of the original Halo's ending. As the Halo ring begins to explode in the distance, he prepares to board a Pelican transport, but before doing so, he turns to the camera and says: "See you in the sequel."
The second clue appears after the credits and is available regardless of the chosen difficulty. A short scene shows 343 Guilty Spark flying through space towards a massive gas giant, next to which a complex is suspended by a cable. Fans of the series immediately recognized this as a direct reference to the events of Halo 2 — this is where Spark meets the Heretic in the Arbiter's first mission.
The content of Halo: Campaign Evolved itself also hints at a possible remake. The game already features several weapons that first appeared in Halo 2, including the SMG, as well as the ability to hijack enemy vehicles — a mechanic that debuted in the second installment. Additionally, in bonus missions, players can fight Brutes, who also first appeared in Halo 2. Such a large number of familiar elements has led many players to speculate that the developers are pre-emptively creating assets and game systems for the next project.