In fact, Sony did put up a teaser image on Twitter that you can check out above, where you see the right hand of a man holding a white device which could very well be a tablet, or a phablet, although we would most probably place our money on the latter. In fact, it does seem to resemble the Sony Xperia Z4 tablet that was leaked out not too long ago.
Assuming the device above that was leaked is actually the Xperia Z4 tablet, then you can be sure that its design would have some sort of resemble to that of the Xperia Z3 – after all, it should run in the family, right? The rounded metal edges would certainly be more than welcome in terms of design, and it is also said to arrive with a 2K display to wow your eyes.