An Amazfit Band 6 device has been spotted getting its FCC certification, which is something of a surprise considering the Amazfit Band 5 from Huami only recently went by the same agency too. It could be possible that "Amazfit Band 6" might be the US market name for the widely rumored Xiaomi Mi Smart Band 5 Pro wearable.
https://www.notebookcheck.net/Huami-Amazfit-Band-6-or-Xiaomi-Mi-Smart-Band-5-Pro-Former-visits-the-FCC-suggesting-it-could-be-the-latter-rebranded-for-the-US-market.481546.0.html
I'm an Amazfit fanboy. I rocked the Bip for a few years and now I'm rocking the GTS. However, my wife is Mi Band fan and can't wait for the new Amazfit band. The Amazfit app is much more advanced than the Mi Fit app so having a tracking band under the Amazfit name is going to be a nice upgrade to all of the American Mi Band users.