One thing I'm slightly irked that they haven't clarified as of yet is the whole ethos behind Armour Abilities returning.
I remember when Halo 3 was revealed Bungie had a clear ethos with what they expected, and what they wanted to happen with Equipment, and how that would impact the sandbox. It was creative, and they broke it down from a design perspective.
Then with Reach, even though I didn't enjoy them, they again revealed the ethos, the design document if you will on what they interpreted Armour Abilities to be and why they were a good evolution to the idea of equipment.
With Halo 4 it just seems as if 343 are accepting and ignoring any explanation as to their interpretation of the mechanic, as if Bungie's design was nearly perfect and all that needed changing was balancing. Which to me sounds far too simplistic given the huge gameplay ramifications these have. They haven't given any reasoning or insight into their interpretation of Armour Abilities, and why, like they were originally an evolution of equipment, these are a smart evolution of their Reach brethren, which, I think we can almost unanimously conclude weren't great.