The specs and pricing info got leaked by UK online retailer MobileFun, and it looks like the XZ3 has a few upgrades in store over the XZ2. While the 5.7-inch remained the same, the new XZ3 will come with a Snapdragon 845 SoC coupled with 6 GB of RAM and 64 GB of storage, a 3,240 mAh battery, dual 19 MP + 12 MP rear camera setup, and an overall reduced thickness of 0.39 inches.
https://www.notebookcheck.net/Sony-Xperia-XZ3-specs-and-pricing-leaked.316952.0.html