The character customisation is not something they've even mentioned in all the video interviews they've done (that I've seen). I suspect that "personalising it's look" means you pick a body, maybe pick a class which gives you a particular body type, and then pick the primary colour and the accent colour. If we're lucky maybe a choice of several body-types per class with different heads.
I doubt there will be any more in depth customisation that that, but if I'm wrong it'll rock my socks off. :)
Hell, maybe it is more involved and they're just sitting on that info until closer to release date. You're right, wait-and-see it is. :D