https://www.techradar.com/news/sony-xperia-xz3-what-we-want-to-see

The Sony Xperia XZ3 is currently rumored to arrive in the second half of 2018, and if it does we'd like to see major changes over the Xperia XZ2 it will be replacing.

It's not that the Xperia XZ2 was a bad phone, but when you compare it to what rivals are offering for the same, or in some cases less, money it's difficult to get excited about Sony's current flagship handset.