An unofficial Sony phone has popped up on AnTuTu with a model number I8134 and a score of 395K. This most likely is the upcoming Xperia XZ4 and the chipset it's running is the Snapdragon 855.
The score of 395K is higher than the 360K we've seen from an earlier Snapdragon 855 AnTuTu test but points to a reasonable average. It's also higher than the Huawei Kirin 980 (~270K) and Apple A12 Bionic (~350K) scores we've seen.
From what we know so far the Xperia XZ4 will have a notchless 21:9 screen, meaning it's taller than current 18:9 and 19:9 screens.
We also know the Xperia XZ4 will have a 3.5mm headphone jack and likely offer a triple camera on the rear. The Xperia XZ4 will also offer fast wired charging to the tune of 46.5W.
There's no option to turn on GPU turbo. Just a performance mode(aka cheats they used just for benchmarking).