Is the difference between commander and grunt armour just the fact 1 of them has their shoulderpads on the wrong way round?
Also I doubt in the SW universe there's a reason why commander has a higher quality looking helmet than the grunts, that would inhibit movement. Its probably just meant to be the same material, but the commander hasn't got his wrinkled yet in battle.
With that in mind i'm thinking we will get a generalised, sanitized version, much like how they beautified the stormtrooper helmet into a symmetrical computer designed looking version (makes me feel like i'm on a computer game when I look at my sandy!)