Models with code names Sailfish and Marlin leaked and it's possible that major differences between two will be screen and accumulator. This are presumed components:
5" 1080p screen for Sailfish and 5.5" 1440p for Marlin
Qualcomm Quad-core 2.0GHz CPU (probably Snapdragon 820, 821 or 823 in both)
4GB of RAM
2,770mAh battery
32GB of internal storage for Sailfish and 32/128GB for Marlin
12MP rear camera / 8MP front camera
Rear mounted fingerprint scanner
USB Type-C port
Bluetooth 4.2
and probably Android Nougat
These informations aren't confirmed but they seem fairly realistic. HTC is responsible for production of these models.
Source: gsmarena