Among the Linaro work for 13.01 was enabling 64-bit HipHop VM development in OpenEmbedded, continued to merge ARMv8 (64-bit ARM / AArch64) support, and there's now initial support for the Arndale Board. The Arndale Board is a development ARM reference board for the interesting Samsung Exynos 5 Dual (ARM Cortex-A15 1.7GHz dual-core) SoC, similar to what's found in the Samsung Chromebook.
The Linaro developers also released a modified kernel based upon Linux 3.8-rc4. Aside from the Linux Linaro work there was also work done on the Android builds of Linaro for January too.
Meanwhile, the Linaro Enterprise Group put out Linaro UEFI 2013.01 with fixes for the native building of UEFI on ARM and improved flashing images on Arndale while enabling native building for PandaBoard.
More details on the monthly Linaro 2013.01 update can be found in this Linaro.org blog post.