I really hoped they did, but Bungie said it was "to complicated". Well, I thought it over one night, and came up with this.
E.V.A (Extra Vehicular Armor)
Helmet: Player is given a better view when in vehicle.
(Meaning the view is zoomed out from , lets say, a Warthog a bit to have more visual aid)
Shoulders: Vehicles maneuverability is increased when equipped.
(For the Covenant vehicles, its increased during the boost)
Chest: 5% increase of the player when in the vehicle.
C.Q.B (Close Quarters Armor)
Helmet: Player can survive one more amount of headshots than the usual.
(Meaning they survive a sniper shot to the head, etc.)
Shoulders: Player is given quicker melee attacks.
Chest: Player can survive a one hit-kill to the back.
Security Armor
Helmet (attached antenna): Increased Radar for the player.
Shoulders: Slower, but more powerful melee attacks.
No Chest plating.
Scout Armor
Helmet: A 2x zoom is added to the visor for enhanced vision.
Shoulders: Increased speed.
(You can't run without moving your arms, most specifically your shoulders.)
Chest: Increases the time for Active camouflage to 5 seconds when equipped.
(Its Scout armor, you need to stay concealed.)
Its all I got for now, stay tuned for more.