In fact, early rumors point to a launch as soon as August, while also claiming that the Xperia Z3 will have a metal frame, just like its predecessors, except that this time around it will be coated in PVD, which should make it more environmentally friendly, corrosion and scratch resistant and give it increased impact resistance.
The same source (Chinese site IT168) claims that it will have a 2.7GHz quad-core Snapdragon 805 processor, 3GB of RAM and an Adreno 420 graphics chip clocked at 500MHz. However it will apparently only have a 1080p display. The source even supplied some images which supposedly show the phones super-slim metal frame.