The 6th Gen iPod Touch is on the compatible devices list for the Osmo, but not for the Osmo Mobile.  Does anyone know if it will for with the Osmo Mobile?  If not, Why?  Is this something DJI is working on?

I can't tell you about the software aspect, but it physically will fit and balance.  I assume that it will work as long as you have WiFi and Bluetooth.  You should be able to email DJI sales to get a definitive answer.

It uses the same chip with iPhone 6, so it does fit.

yes think so