The Samsung's Exynos 5 Octa platform couldn't make it to all the Galaxy S4 flagships, so it was replaced by the fastest Snapdragon chipset available at that moment - the Snapdragon 600.
According to SamMobile's trusted insider, all Galaxy Note III smartphones will be powered by the Exynos 5 Octa platform. There is even more: the GPU inside the chipset will be Mali-450 with eight graphic cores. You could also expect 3GB of RAM.
The rest of the Galaxy Note III specs should include a 5.99-inch 1080p Super AMOLED screen with the same pixel structure as the Galaxy S4's display, a 13MP camera, S-Pen, and full-blown connectivity package. As the rumor has it, the Galaxy Note III will be as big as the recently announced 5.8" Galaxy Mega, which means smaller screen bezel.
The Galaxy Note III is rumored to run on the latest Android version available, probably 4.3 Jelly Bean. The Samsung's proprietary TouchWiz Nature UI will be on top with some new S-Pen features for sure.
We expect Samsung to announce the Galaxy Note III at the IFA 2013 in September in Berlin.