Nothing new, just speculation. I was the one who started the thing about cultural significance, possible sign of mourning incidentally.
Had another thought. Have all the bald elves thus far been male and mages? Can't remember clearly. Zathrian was, that elf who killed his wife was, Orsino was. May be the static from the magic makes their hair fall out. Or they want to avoid it catching light when they start throwing fire balls. Unless the designer just want to show off the ears. Hair does tend to cover them up quite effectively.
I perfectly okay with him being bald but I'm getting increasingly keen on it having some sort of significance. One thing it does seem to show up - he doesn't have any tattoos, so either not Dalish or doesn't consider it necessary to have tattoos to be a grown up elf.