Details of three devices from Huami's Amazfit range have been leaked. The wearables are supposedly the Amazfit Pop, Amazfit London, and Amazfit GTS 2 Mini. While few concrete specifications have been revealed, it seems the GTS 2 Mini will still offer users the opportunity to constantly track their heart rate.
https://www.notebookcheck.net/Amazfit-GTS-2-Mini-Amazfit-Pop-and-Amazfit-London-smartwatch-details-start-appearing-as-Huami-tools-up-to-add-to-its-extensive-lineup.497950.0.html
Huami is following Xiaomi with the model confusion.
Bip Bip Lite Bip S Bip U
GTS GTR GTS2 GTR2 GTS Mini Zepp E Zepp R Xiaomi Color Watch Xiaomi Mi Watch Xiaomi Watch