It's hard to talk about "mini" suffix with 5,3-inch screen in phone, but we have times we have so...
(Mini/standard/Plus)
System: Android 6.0;
Screen: 5,3" 720p/5,5" 1080p/6" 1080p;
SoC: MediaTek MT6753T/Helio P10/Helio P10;
RAM: 3/4/4GB;
Storage: 32/64/64GB;
Cameras: 13+5/13+8/16+8MP;
Battery: 4000/5000/6020mAh;
Others: -, dual SIM/fingerprint scanner, dual SIM/fingerprint scanner, dual SIM;
Size: 149x73.3x8.2/152,3x75,3x8,2/160,5x80,6x8,2mm;
Weight: 170/180/215g.
As we can see it's smaller then rest of family but still a little too big for my taste to use Mini in name.
Taking into account components it's mid-end model but still no tragedy here.
We don't know price still but with reasonable one it can become quite good option as upgrade.
Source: mGSM (polish) and other sites