Considering how freaking jacked Halsyn the wood elf druid is, I think it's fairly safe to assume that there will be at least some body type options added later. The priest of Loviatar is covered in enough scars to hope for being able to add marks and damage too.
Of all the things to hope for I'd say the biggest one is more in-depth face customization - maybe not sliders, but at least choosing individual parts (eyes, noses, overall shape) and skin texture.
