Ahead of the release of Halo 5 this month, Microsoft has published a video today and an in depth blog post for the Map Editing Forge Tools. Forge mode was originally introduced to Halo in 2007 with Halo 3, and as you'll see in the video which i will be posting down below, It has come a long way since then. Forge mode for Halo 5 will not be available at launch on October 27th Instead it will be released in sometime December as a post release update.
https://www.youtube.com/watch?v=oDltTQiZMmw"For Halo 5: Guardians, we knew we wanted to take a giant leap forward with Forge," 343 said. "The creativity of the Forge community knows no bounds and our goal was to give them more power and control than ever before. We wanted to remove as many constraints as possible so they can create high quality maps that rival the ones that we are shipping with the game."
"Halo 5's Forge is the biggest evolution of the feature since the original was released with Halo 3," 343 explained. "Rather than just tack a handful of new features on top of what's already there, it was important to examine every nook and cranny to make sure even the foundations for building with Forge were up to snuff."