Sorry kids, no wing-swapping.

Myth Games has a nice Q&A session with Aion's Senior Game Designer, Kyoung Won Choi, about many of the game's features.

How extensive will Aion character customization be?

In the game client, which was being showed at the Games Convention Leipzig ‘07, the player had the ability to choose between several different hairstyles, colours, shapes of their face, skin colours, character height and voice. It is also possible to alter eye colours and to add tattoos to the character face. A character build feature is currently being planned, which will affect the size of the character, ranging from skinny to big.

You can keep reading at Myth Games.