Some details of Samsung's next generation rival to the Nvidia Tegra 3 have begun to appear on the Kernel Git page. Sammyhub claims that Samsung is working on the upcoming Exynos 4412 chipset and has added support for it on the development boards.
The product is likely to be made of four ARM Cortex A9 cores and clocked at 1.5GHz, possibly with a number of ARM Mali-400 GPU cores in addition.
The article also mentions that Samsung is working on its next-generation Exynos ARM Cortex-A15 system on chip that will support ARM's big.LITTLE architecture, which combines powerful cores (like the A15) with power efficient ones (like the A7).
The last few months have proved to be rather interesting for Samsung Electronics. The company had for a long time declined to mention any Exynos parts other than the Exynos 4210 which powers the Samsung Galaxy S2.
Furthermore, it has added a number of rivals (Qualcomm Snapdragon, Nvidia Tegra 2) to its own flagship products (e.g. Galaxy S2) which leads us to believe that either demand has surpassed supply or that Samsung is facing some other undisclosed issues.