I asked on the official forum about preorder codes and whether I needed to replace my SE code with my new CE code in my account. This is the official answer that clears up a few other things around here e.g. early access -
That's a shame to hear, I have no doubt by the time I receive and use my retail key I'd have missed out on use from the collector stuff and VIP shop stuff, sure I can still use the rest from current level onwards.
But if I paid for CE edition, I want those CE items from the moment I log in.
Seems we won't on headstart, another score for the useless lemmings at bioware/ea/whoever decides these things.
They may seem minor issues but issues none the less, of which many are starting to stack up and no doubt more to come.
Regardless though, it will have nothing to do with how good/bad the game is, just the way things are handled currently, especially customer reps.