Along with the Xperia Z3, Sony has launched the Style Cover SCR24 that includes quick-view window functionality. With this cover you can access quick features of the Xperia Z3 without opening the cover.
To set up the case, you can use the NFC feature to set which smart window apps and widgets you want to see. Then these apps you set will be visible when you close the case. This means you can interact with the Xperia Z3 (answering calls, controlling music, see missed notifications etc.) without opening the cover.
The case is available in four colours to match your Xperia Z3 (black, white, Copper and Turquoise). The Xperia Z3 is expected to be launched at the end of this month, so we’d likely see this case to be launched in the same date.