We saw a lot of new devices at the Mobile World Conference 2015, but we were disappointed when Sony didn't unveil a new flagship. Sony gave us glimpses of their Xperia tablets, but we saw nothing about a flagship phone. Maybe it's part of a strategy by Sony. As Sony continues to hold back information about its latest developments, it seems to just make me want it more. We got our hands on the newest leaked 3D renderings of the not-yet-released Sony Xperia Z4. Let's take a look at what we can expect from the next Sony flagship.