Cut Halo 4 levels

During the development of Halo 4, company Digital Extremes was contracted by 343 Industries to help with the production of the game's DLC map packs. A number of map ideas and concepts were pitched to 343 but went unused, and have since been released online.

Arrowhead
"Arrowhead" was one potential DLC map concepted, and evidently would have taken place in or around a UNSC facility embedded in a cliffside, though no other details are known.

Dish
An original map design developed by Creative Assembly and referred to as "Dish" can be found in the tags build. The map takes the form of a long canyon, with multiple levels. The map is complete with vehicle and turret spawns, alongside respawn points for players - though appears not to have progressed beyond the early blockout stages. Interestingly, this map contains spawn points for the Revenant design which was intended to appear in the game. The relatively late cutting of the Revenant from the game indicates that Dish may have been in development relatively late in Halo 4's development cycle.

Covenant underwater technology
This potential DLC map was designed to focus on underwater Covenant technology.

Genessis
Identified in a series of concept art uploads all titled, this map has a similar theme to the release map Vortex, set in a crashed Forerunner ship in a desert wasteland, turned into a makeshift base by the UNSC. In the distance, a Forerunner Keyship can be seen. It is unknown if this pitch has any relation to the planet Genesis featured in Halo 5: Guardians.

Last Resort remake
One map concept shown involves a paintover of the sniper tower area of the Halo 3 map Last Resort. Its filename,, suggests it was intended to be a Last Resort remake. Notably, the map was later realised in Halo 2: Anniversary's multiplayer as Stonetown.

Narrows remake
One concept pitched to 343 involved a remake of the Halo 3 multiplayer map Narrows, redressed in a human architectural aesthetic.

ONI Bog
Concept art for the map suggests it would have had a similar theme and tone to the map Abandon, though it is unknown if the two maps are one and the same, or simply similar.

Standoff remake
Present in the Halo 4 tags build, this map was in development by Creative Assembly. The map was a remake of Halo 3's Heroic map Standoff.

Other DLC map concepts
Some callout sheets for individual map props have been posted online, of which tie to no particular known map.