Sony could be working on a huge device known as the Xperia Z4 Ultra.
The Sony Xperia Z4 Ultra is expected to have a 5.9 inch Quad HD screen. The phablet may also have a 16 megapixel rear facing camera. Android 5.0 Lollipop is also expected.
The Sony Xperia Z4 Ultra is expected at CES 2015 or MWC 2015.