Samsung are currently developing a new Exynos processor this time it's the Exynos 5420 , According to files from patchwork.kernel.org this seems to be compatible with many platforms now we're hoping that it is completed on time and works well. As the Octa-Core 5410 Exynos processor didn't work out the way Samsung wanted it to. There are no specifications for the Exynos 5420 as of yet but we know it's definitely an Octa-core processor.
A fair amount of Galaxy S4 Exynos edition devices are running very hot with many bugs , Samsung promised updates to fix the issues. Two major software updates have rolled out since and none of the major problems have gone away.