Armor abilities would not make sense story wise seeing as they were not in halo 1,2,3 or ODST, but they could implement an AA ability type thing, because it has been mentioned the new planet mc is arriving at has new technology in it, such as warthogs equipped with hover enablers(dunno what they are called) So they could but in an AA system, but i think it will be different from reach. But if master chief sprints.......