UPDATE: Turn 10 has said the car will be gifted to Forza Motorsport 5 VIP members later this month.
The original story is below.
343 Industries says it will reveal more details about accessing the limited edition car in the future, but if it ties in with the game's much-criticized economy it probably involves shelling out your life savings of in-game credits.
Previous collaborations between the Halo and Forza franchises saw the UNSC's ubiquitous Warthog vehicle feature as an Autovista easter egg in Forza 4.
Halo: Spartan Assault will be released for Xbox One on December 24.
A video of the custom livery can be viewed below: