'Xperia Z ULTRA' as Phablet developed by Sony?

The horizon of phablet is growing: the large smartphone located at the border between Smartphone and tablet . Initiate by Huawei, this
trend can draw the future of the smartphone. Following the rumors around the upcoming HTC phablet, now, it seems also that, Sony develops its own 6.4" phone (the 'Xperia Z ULTRA'.
 It is announced with a 6.3" full HD display, a 2.3GHz quad core Snapdragon 800 processor, 2GB of RAM and Waterproof.