Well, not exactly a secret but Samsung Galaxy S IV makes an appearance in Antutu Benchmarks, both the Korean variant (SHV-E300S) and the International variant (GT-I9500). According to the benchmarks the Galaxy S IV has an Exynos 5 Octa processor clocked at 1.8GHz and it runs Android 4.2.1 Jelly Bean out of the box. 

The Samsung Galaxy S IV has been planned for the first half of 2013. The Galaxy S IV is rumoured to feature an Exynos 5 Octa (8-Core) CPU, Mali-T658 (8-Core) GPU, 4.99 SuperAMOLED Full HD Resolution Display, 2GB of RAM, 13 Megapixel Rear facing Camera capable of shooting 1080p Full HD Videos at 30FPS, 2 Megapixel front facing camera capable of shooting 720p HD Videos and run Android 4.2.1 Jelly Bean out of the box.