According to sammobile.com and some other tech websites, the upcoming Samsung Galaxy S4 tech specs are rumored to be as follows :
Exynos 5450 2.0GHz quad-core processor based on Cortex A15
5" Super AMOLED Full HD 1920x1080 display
If any of these specifications is even near true by itself, it would be pretty awesome. 2.0GHz quad-core CPU? Unreal.
And that holy grail of all OLED screen aficionados, the Full HD Super AMOLED display, hopefully with a "+" non-Pentile arrangement. If they could pull that off, itwould be a technical coup of the highest order. After all, Samsung did show that they could pull off a Retina-busting 2560x1600 display with the Google Nexus 10, albeit with PLS tech, so the next logical step would be to do something close to that with AMOLED.
However, these are all early stage speculations. The photo is a purported early rendering as well. We shall watch and see what the actual product specs will be like.