Motorola created a website for all the official phone cases
Motorola's M4DE program was created in 2013. Its partners are the "official" providers of mobile accessories. Most popular phone cases makers like Incipio are part of it.
To organize it all better, and complement the Motorola Home brand licensing business, Motorola created a dedicated website where you can check all the approved/partners and all the phone cases for the current phone portfolio.
You can see different cases for phones from the Moto Z to the Moto E by Otterbox, Incipio, Tech21 and others. There are lots of options for the most recent devices.
You can find them all here at cases.motorolahome.com.