So I found some bone conduction sunglasses on indiegogo that are really intriguing. Does that count as true wireless? A guy I work with has bone conduction headphones and says they're pretty awesome, but I don't think he's really an audiophile
https://www.indiegogo.com/projects/snd-ray-the-best-hifi-bone-conduction-sunglasses/x/25383823#/
Wow, that's really something! It's not exactly IEMs, but I would be very curious to see how they sound! Maybe read early reviews