Because of master chief going into a forunner planet, well then they should make some forunner weapons like a forunner dmr or battle rifle that shoots red plasma or a forunner sword that is like a real sword but made of energy or a forunner bruteshot that shot plasma or an energy sniper rifle.
Maybe some weapons like those attached to the arms, although Chief would have to pick them up from the ground.
yeah that would be so cool