We are getting more insight about changes since E3 multiplayer built. DominoTheory & Mastrbiggy stated via twitter:
Overshield invincibility is gone in newest build, Carbine a tad nerfed, and Pistol has unknown changes.
Thruster also goes to 3rd person view as their way of balancing it in the newest build.
Promethean vision nerfed.
Promethean grenade = Emp field stays for a few seconds. The radius is similar to that of a plasma grenade explosion.
PV has longer recharge time and shorter usage time
PP DOES stun/disable vehicles
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Halo 4 Multiplayer Changes Since E3