Samsung GT-I9500 and Samsung SHV-E300S (S stands for SK Telecom carrier) details emerged on AnTuTu benchmark showing an 1.8GHz matching the newly announced Quad Core Exynos 5 Octa processor and Android OS version 4.2.1 (JellyBean), plus according to the AnTuTu score (which you ca see in these screenshots) it is more powerful than the CPU currently equipping the GALAXY Note II.
Model number GT-I9500 has been linked in the past with the GALAXY S4 name, the next GALAXY S flagship smartphone South Korean manufacturer will be launching in the first half of 2013. We do not know for certain if GT-I9500 is the upcoming GALAXY S IV, but we know that there is another Samsung device GT-I9800 which recently received WiFi certification.
I guess the time will solve all these riddles and besides we are under a month away from MWC 2013 where Samsung should unveil a dozen of new handhelds.