The pictures you see below are supposedly of the Sony Xperia Z4 front panel. The leaked pictures, from an account on Weibo, show a very similar-looking front panel to the current flagship line and highlight that design-wise, not much will change with the Xperia Z4 i.e. OmniBalance is still very much prevalent.
Of course, this is not the first time we have seen the front panel of the Xperia Z4. The pictures below match the previous leak of the same components back in mid-November 2014. The part shows that the front-facing camera and proximity sensor have swapped places when compared to the Xperia Z3.
It also shows that Sony will go back to the stereo speaker placement as previously seen on the Xperia Z2, towards the edges of the top/bottom. This speaker placement also matches the only render seen so far from the Bond product pitch email leak.
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