This is a new version of the app labelled DJI Go 4 specifically for DJI latest products like the Mavic and Phantom 4 Pro, this new splits off from the previous version and will be supported separately .
This new app supports the following products
Phantom 4 Pro
Older products such as the P3 and the professional products like M600 etc will continued to use the existing DJI Go App currently at version 3.1.
I would suggest everyone downloads this new App if your using one of the above products.