The ARM SoC pull went in early this morning with new and updated SoC support for the Linux 3.13 kernel, one day after the merge window opened. There's better AM33XX platform support, i.MX clean-ups and updates, support for two new Renesas mobile chipsets, and other clean-ups and small updates. The big change with this pull is the landing of Tegra 124 support, a.k.a. the Tegra 4.
The Tegra 4 "Wayne" is a quad-core ARM Cotex-A15 CPU clocked up to 1.9GHz, and 72 GPU cores at a 672MHz and up to six times faster than the Tegra 3 graphics. The Tegra 4 is already found shipping in NVIDIA's own Shield gaming device along with the Microsoft Surface 2, HP SlateBook X2, ASUS Transformer Pad Infinity 2013, and numerous other devices.
With this Git merge Tegra 4 (124) support is now mainline in the Linux kernel.