Samsung has been introducing via @SamsungExynos twitter account that they will introduce the latest Exynos 5 Octa processor. Although the day is not yet come, leaks on the latest SoC chip that has begun to circulate.
According to DDaily Korean media, the chip is the Exynos 5420. This represents an increase of Exynos 5410 chip that used internationally in Galaxy S4. Rumored that there is a difference on the GPU (Graphics Processing Unit). Exynos 5420 uses while Exynos 5410 Mali GPU PowerVR (SGX544MP3).
Not mentioned in the detai of Mali GPU type used, but is expected to Mali-T604 or Mali-628. For comparison, PowerVR SGX544MP3 has three core, while the Mali-T604 using quad-core GPU, and the Mali-T628 is eight cores. Samsung is using the Mali-T604 in their Exynos 5250, so the possibility of bringing Exynos 5420 Mali-T628 GPU.
A number of people believe the Exynos 5420 chip will be used for the new Samsung phablet is Galaxy Note III.[source]