Although the Xperia Z4 has yet to be announced, the first batch of Z5 details has already emerged.

There are leaks and there are leaks. Although Sony hasn’t unveiled the Xperia Z4, the first set of hardware rumors for the Sony Xperia Z5 has just come to light.

According to sources close to AndroidOrigin, Sony Mobile plans to release three versions of the Xperia Z5 in late 2015. Should this prove true, we could have an Xperia Z5, a larger Z5 Ultra and a smaller Z5 Compact before the year is out.
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https://www.cnet.com/news/sony-xperia-z5-rumors-already-bubbling-to-surface/