Answer for the moment knows only Samsung employees. But speculations in Asia are loud enough thet it can be real (plus succes of iPhone SE is another argument). We have also suggested specyfication:
System: Android 6.0;
Screen: 4.6" FHD, sAMOLED;
CPU: Snapdragon 820/Exynos 8890;
RAM: 3GB;
Storage: 32/64GB;
Cameras: 12MP rear and 5MP front;
As you can see, it would be interesting option. To check if this dreem will come true we must wait to August 2 for Samsung Galaxy Unpacked - if mini will not be shown there it will stay just a dream.
Source: gsmmaniak (polish)