I haven't heard if any date for Nougat has anyone else
Only thing I have heard was, its coming this quarter http://www.droid-life.com/2016/09/27/moto-z-moto-g4-nougat-update-release-date-q4/
*Could* be coming this quarter. It's more likely "probably", but, technically, they said, "expect to see Android N on the Moto Z family and Moto G4 beginning in Q4". Perhaps it's unlikely, but that could mean that only one of the phones will get it starting in Q4. Or that the unlocked version of the Z will get it Q4, with the Droid editions coming later.