And it’s for Xbox 360, meaning the console has enough power to do something like that. Of course, it might make it a bit hard for newbies to grasp, so maybe a “Basic” mode and an “Advanced” or “Dev” one? I don’t know. Anyway, it probably depends on whether or not 343 has enough time to do a really in-depth Forge mode, or whether they want to gloss over it and disappoint their fanbase.
Far Cry 2 was lovely, but it didn’t have enough features.