Being released by NVIDIA this afternoon is the Tegra 12 Alpha 1 Linux release. This is a Linux software release intended for developers using NVIDIA's Tegra 2 platform.
The NVIDIA Tegra Linux 12 Alpha 1 release is based on the Linux 2.6.38 kernel and is derived from Ubuntu. Graphics standards supported by this Tegra-ified Ubuntu release include OpenGL ES 1.1/2.0, EGL 1.3, OpenMAX IL 1.1, and RandR 1.3.
For those interested in Linux for Tegra 12 Alpha 1, the relevant links are available from this forum thread