This new teaser image shows a close look of its camera, as you can see there is a symbol of G which possibly means this phone will have G leans which Sony normally use on its DSLRs and Digital cams.
Just to recap, Sony Xperia Z1 will have 20.1 mega pixel camera with BIONZ image processing engine which means it can shot 4K resolution videos. It also has LED flash just below camera.
This phone will have 5 inch screen with full HD screen resolution, it will be powered by quad-core Snapdragon 800 CPU ticking at 2.2GHz along with 2GB of RAM and 16GB of internal memory. This phone will be water and dust proof.