I highly doubt you'll be able to change your facial features. Presumably, the core gameplay feature of Destiny is around the FPS aspects of the game. You will be in combat, with bullets flying around your head. In these scenarios, you would wear a helmet. Having customizable features under a helmet would require a significant amount of modeling, development, testing, etc, all for a feature that wouldn't be seen during most of the gameplay. I agree, it would be a cool little feature, but one I don't see Bungie putting high on the priority list. As far as the style of the current helmets go, keep in mind that we've mostly only seen concept art. I'm sure Bungie has a slew of helmets planned for us to unlock and choose to wear. Some may have visors, some may not. Some may be plain, while others may be ornate. I have high hopes.