Looks like Redmi also will be joining the Android Go family! About few weeks earlier this smartphone is certified by Singapore IMDA with a model name M1903C3GG and this smartphone now appears at SIRIM website along with US FCC and Europe EEC certified!
Some hardware information were able to obtain from SIRIM website in which it has a 5.9 inches display, Dual SIM standby and Bluetooth 4.2. As an Android Go smartphone, Redmi Go runs on Android Pie Go which is a highly simplified OS designed for entry level smartphone.
Given above specifications, there could be a chance where the Redmi Go is cheaper than Redmi 6A.