Russian division of Lenovo just yesterday introdused ultra low-end model.
System: Android 5.1;
Screen: 4″ 480p;
CPU: Spreadtrum SC7731 4@1,3 GHz;
RAM: 0.5GB;
Storage: 4GB + microSD;
Cameras: 5MP rear and 0,3MP front;
Battery: 1700mAh;
Others: DualSIM;
Size: 124,5x64x10,6mm;
Weight: 132g.
I don’t know why this was constructed now but if price will be higher then $15-20 I predict low interest outside of developing markets. Unless… it’s very cheap model for 3rd world countries.

Source: mgsm (polish)