Hi,
I think that everybody expects like changing all visuals, maybe selecting all the stuff, equipment and so on.
To be able to create all from yourself to Chuck Norris.
Its not really neccessary.
There could be like standard visual customizations - body strength, hair style,...;
but all of other thing like equipment are bound to gameplay and should be looted during playing the game,
I would not mind at all to have just predefined visual for each role, if it would be "player's temper neutral.",
meaning that as youg boy in real world you won't be playing as some fat girl which kills everyone with rocket launcher.
Geralt is somewhat good example - old and not old, wise but stupid, strong but weak,... does not look like superhero in crowds on the streets.