The technology used for this dispay will be an active matrix organic light emitting diode that has organic components which together form the electroluminescent material, popular known as pixels.
This mean that Samsung is finally able to compete with Apple in terms of accuracy of the image and quality. It is known that the OLED technology does not shine so strong.
Samsung Galaxy S4 will have a very powerful processor, like the one on the Samsung's tablet, a quad core, 2 Ghz, more powerfull that the one Samsung Galaxy S3 has. His score would be even better than the one similar phones like LG already has it.
My biggest curiosity now remains how the technology for recognition of eye movements work for accessing menus or scrolling a document. However, if Samsung has managed to equip this phone with this amazing features, it will have a lot to gain.