As we know, armour lock and bubble shield have been confirmed as to not being Armour Abilities in Halo 4.
But they could make a return as grenades
Bubble shield could easily be a grenade, similar to halo 3 E3 trailer, throw it down and it expands on impact.
Armour lock could become a Cryo grenade that freezes what ever it touches for a few seconds, but makes them relatively invulnerable to damage, could work on vehicles aswell. (I don’t really think this one would work well, but it’s just an idea)
What do you think?