All we know at this point is that, yes, Lenovo is still testing Nougat on Moto G4 Play. The company isn’t providing a timetable like it did earlier this year, though. That’s likely because it doesn’t want to give false hope and disappointment to their customers.
If you own a Moto G4 Play with custom recovery installed, you can install the Android 7.1.1 Nougat with September security patch. XDA Developer "Q9Nap" has converted the last Official Android 7.1.1 Nougat Soak Test into a flashable zip file.
Just download the ZIP file from the below link and use TWRP recovery to flash it on your Moto G4 Play. I've been using this firmware from past couple of weeks and haven't found a single bug.
Also Read: Forget Nougat, You can now Install Android 8.0 Oreo on Moto G4 Play
Download: 7.1.1 TWRP Flashable | Via XDA