Well it wasn’t completely unknown that the reason Exynos 4 wasn’t in the package of US carriers was because it’s lack of support for the 4th Gen (4G LTE). The assumption was that Samsung had to use the Snapdragon 600 to provide LTE support for regions like the US and UK, leading many to believe that the Exynos 5 Octa simply did not support the wireless standard.
Taking all this into consideration we think this decision is likely to be due to a supply-demand anomaly and not the lack of technology itself. And if you find yourself disappointed by no Octa-Core availabilty in your country then think again , the Octa-core is simply ARM’s big.LITTLE framework, meaning there are four cores for handling the power-sapping activities and four for handling the phone’s mundane tasks, which will result in smoother performance and better battery life.