https://www.techradar.com/news/sony-might-be-cancelling-the-xperia-z5-tablet

We haven’t seen a tablet from Sony since 2015’s Xperia Z4 Tablet, and it has now emerged that we might not see any future ones from the company.

According to a ‘reliable source’ speaking to Android Marvel, Sony was working on a 10-inch Xperia Z5 Tablet and an 8-inch Xperia Z5C Tablet, both of which were set to launch this year, but both of which have now been cancelled as “the sales didn’t go as expected for 2018 high-end phones including Xperia XZ2 and XZ2 Compact.”