Forge

Halo 5: Guardians' Forge mode won't be available at launch, but is coming as a free service in December 2015. [1]

The updated Forge mode is said to have over 1,600 objects and new types of objects. The controls and building tools have also been reconfigured. [2]

Controls

The Forge control scheme has been entirely revised to accompidate new tools. Here are some of the updates. [3]

• Multi-Select/Edit - Select up to 64 individual objects at once (more objects can be selected if they're already bundled as a Group) and manipulate them.
• Free Camera?
• Precision Editing
• Smart Magnets
• Grid/Rotation Snaps
• Contextual Control Helper