Whatever they do, let's hope they don't decide to stick a camera in it (for AR purposes), or it could be another Google Glasses fiasco.
If Apple comes out with AR glasses with cameras, no one will bat an eye. (And if they do, Apple will already have a great story for why it isn't an issue.)
If Apple does it, everyone will want one. Apple makes great products and has the best marketing of anything ever. Even if it has a camera going 24x7, people will be able to live with it.