Following new technologies could be implemented:
Screen:The Screen size of the iPhone 6 will be increased once more. It will be a 4.8 Retina+ sharp IGZA display with 1080p HD resolution. The display will go from edge to edge. Because of the edge to edge design the well known home button available since the first generation iPhone will disappear.
CPU:It is more or less clear that apple will bring a update on the processor as well. The current dual core process will be replaced by a quad-core A7 chip.
Camera:Apple bought a camera sensor from Sony. The new iPhone will have a 3.2 front facing camera and a 13 mega pixes rear camera with 3D support. Maybe it is a dual lens camera. The front facing camera will recognize eye motion and with this technology it should be possible to use the device without touch (similar to Samsung Galaxy S4)
Wireless:Apple will build in the latest communication standards such as 802.11ac wi-fi connectivity. In addition Apple will introduce a wireless charger.
Operation System and Storage:It is clear that the new iPhone will run iOS 7 with the new design. Storage capacity will be doubled to 128 GB storage capacity.
the new device will be released in the last 2 weeks of September this year. The question is if Google will bring their latest Android version including new Nexus devices within the same time span.