For Halo 4, I believe 343 should take the abilities you know and love/hate from reach and make them like equipment, as in:
Temporary use, varied by ability
Picked up on the map
Does not change your spartans appearance
Will not take over classic Halo gameplay
Given that you still have the option in custom games to create loadouts and define equipment usage, Reach’s amazing latitude for customization can remain alongside good ol’ fashioned gameplay reminiscent of Halo 3. I believe that while Reach’s armor abilities are great additions to the formula, starting with them and retaining them throughout a match diminishes the multiplayer formula we all know and love.