@ljo: I've got a report from one XZ3 user which got boot stuck on Sony logo (see XDA thread). From the description it sounds like device booted (According to LEDs), but graphics refused to start. Which means that we will probably need to debug it a bit before we make it work. Let me know when you get your device and time to hack around it. I am sure its a small issue and we will find the solution to it.