HTC is sending out emails to customers that have pre-ordered the HTC 10, stating that they will receive a "small token of appreciation" from the company for purchasing the handset.

From the Reddit thread:

HTC 10 mystery gift

There's no mention as to what the surpise gift may be, but it could turn out to be an accessory like the Ice View case, or the HTC Active Earphones. It could even be the Hi-Res Audio Earphones, which aren't bundled in the U.S. edition of the phone.

What are you guys hoping the mystery gift will be?

Thanks Steven!