The image shows the tablet being used poolside, hinting that the slab will continue with Sony's trend of waterproofing the Xperia line, including tablets. The smartwatch in the picture is also presumed to be resistant to water.
The image appears to be mistakenly included in Sony's promotional layout for its Sony Smart Band. Ooops. As a result of the boo-boo, we can now look forward to seeing the Sony Xperia Z3 Tablet Compact, and the Android Wear powered smartwatch, both see the light of day in less than two weeks.
source: Sony via XperiaBlog