I'm assuming that although I have the beta installed, steam doesn't yet 'know' that I have bought it, as the key hasn't arrived yet. So when I enter the key form GMG, it will think it's a 'new' game and I will have to redownload the game. Meanwhile, will not get the open beta that you guys have kindly left open until release for those that steam already 'knows' have pre-ordered.
I'm a bit gutted, but as you say, it's not the end of the world
