include items form Halo 3 and Halo Reach into Halo 4 forge world, all forge items form other maps should be allowed to be used in forge world.
inlcude items texture change for forge items.
include more moveable items that dont weight to heavy.
include forge settings of the terrain of forge world to spring , summer , fall , winter
and include fx like snow,rain,fog,winds.
include flat surface to forge like sandbox.
include more vehicles and fun vehicles like forklift, golf kart just some ideas.
bring FireFight back with sets of enemys that you faced form Halo 1 to Halo Reach, bring flood to firefight.
online vs… include all halo classic maps form all the halos.