We should totally be able to change our characters race/markings/gender and all that good stuff, like there could be a new NPC in the tower over by the emblem chick and you could either have to pay a certain amount of glimmer or motes of light (since they're pretty much useless nowadays [except for the engrams that xur rarely has]).
Once the *insert currency here* has been paid to this NPC, it could bring up that same old screen that was initially used to create your character and you could change all the same stuff that was offered to you at the beginning.