The devices getting the M Dev Preview are the Xperia Z3, Xperia Z3 Compact, Xperia Z3 Tablet Compact, Xperia Z2, Xperia Z2 Tablet, Xperia Z1 Compact, Xperia Z1, Xperia Z Ultra, Xperia E3, Xperia M2, Xperia T2 Ultra and Xperia T3.
Sony also explains how to install the Developer Preview ROM, and you will need an unlocked bootloader.
It is pretty clear the preview is not made for everyday use or for the casual user, but developers will likely get to work as soon as possible.
Written by: Andre Yoskowitz @ 22 Jun 2015 22:12