Just under a month ago Google released the Android M developer preview for Nexus devices and for those who want to see what it brings to the table. While it isn’t quite everything it will be when it is officially launched, it brought some great changes to the OS. Now we have the same Android M preview being released by Sony for select Xperia devices. Sony has actually been pretty open about development and have offered an Open Device program for quite some time. When creating a software update/preview build, the manufacturer has to do some leg work when it comes to the chipset, binaries and other critical bits of code for their devices. That is exactly what Sony has done for those eager to check it out, but who don’t own a Nexus device.
Source: Sony | Open Device program list | Sony Binaries for Android M | Install guide