The Sony Xperia Z4 was not announced at MWC 2015, but images of the smartphone have arrived.
The above images compare the frame of the Xperia Z3 to the Xperia Z4. The Xperia Z4 is expected to carry the OmniBalance design that Sony has used for quite a while. The images show that the micro USB port will not have a flap covering it. The micro USB port may no longer be on the upper left side of the handset and could be relocated to the bottom of the device.
There are also some other changes to the Xperia Z4 such as the location of the microphone. Take a look at the images above and see how the Xperia Z4 may have a slightly altered frame when compared to the Xperia Z3.