A just-announced Halo: The Master Chief Collection mod project is working on a full singleplayer and cooperative campaign in the style of Halo: CE and Halo 2, and has released a trailer, statement, and screenshots that are pretty promising.
The trailer does some flyover shots of what might be the destroyed colony world of Reach before transitioning to the familiar environment of the Halo ring, then showing off some unique takes on the older covenant alien designs.
The RedShift team, a seven person group called Blimp Brigade, described their project like this on ModDB: «RedShift is a large open-ended Halo campaign that can be played either solo or cooperatively with up to 4 players.
This is a brand-new campaign. All of our levels are being made from the ground up, with a completely unique story and new set of characters.
While we are drawing our inspiration from Halo: Combat Evolved and Halo 2, we are particularly looking far beyond the world of Halo to make sure we have an experience that is completely unique,» they said.