[GretchenEE]

when Gandalf appeared in the preview in his white robes and with his long straight hair

His resurrected eyebrows are different, too.

[Mamzelle]

I noticed the straightening effect, too! I'll bet that was a matter of controversy in the make-up crew, who decided making the beard and hair silky would take away from the danger of a Santa Claus appearance. Think of a white, curly beard and you also think of Saint Nick.