It looks like the Korean variant of the Samsung Galaxy S4 (SHV-E300S) will be using an Exynos 5 Octa SoC with LTE onboard.
Samsung has been performing network tests with the Galaxy S4 from the past 29 days and has just finished this week. To test the Galaxy S4 in public, Samsung used a square box casing on the device to prevent the design from being leaked. The Korean Galaxy S4 is scheduled to be made available in the Korean market starting from the end of April or in the first week May.
The Galaxy S4 features a 4.99” Full HD Super AMOLED Display, an Exynos 5 Octa CPU, PowerVR SGX 544MP3 GPU and a 13 Megapixel Camera. The device comes with Android 4.2.2 Jelly Bean and Samsung’s TouchWiz Nature UX 2.0 running on top of it.
Source: AndroidAuthority/ SamMobile/ Naver