US buyers typically get the best price for new gadgets, but that brings about its own sort of issues. The HTC 10 will not be available in 64GB form in the US and you won't get the High-Res headphones either.
The HTC USA and HTC Canada Twitter accounts have both confirmed that the new flagship will not have the premium headset included. Going by the T-Mobile unboxing, at least it will come with Quick Charge 3.0 charger.
Don't forget to use the $100 discount coupon code, with that money you can buy your own fancy headset. The High-Res headset is shown on HTC's US site, but there's no price for it yet.