Custom avatars are currently disabled, there are rumors that they will be re-enabled in a few weeks when things calm down but as far as I know that's unconfirmed. I would say it's extraordinarily unlikely they will grant individual users their own custom avatars as this would only lead to the admins receiving thousands of avatar requests and they don't have the resources to deal with this. You may have seen some members with custom avatars already - these are the moderators, everyone with mod privileges has already been granted custom avatars.