There's a growing number of features coming about for the Linux 3.5 kernel. Covered so far has been the DRM GPU drivers, input, input, and other areas. The ARM architecture has also been enhanced with Linux 3.5.
The mainline support for SPEAr13xx SoCs has finally landed. The SPEAr Embedded Microprocessors come out of STMicroelectronics and use the ARM Cortex-A9 for the 13xx series. The SPEAr 1300 SoCs support DDR2/DDR3 memory, USB 2.0, Gigabit Ethernet, PCI Express 2.0, and Serial ATA, among other capabilities. The SPEAr1310 and SPEAr1340 evaluation boards are supported. Already within the Linux kernel there has been SPEAr310, SPEAr320, and SPEAr600 SoC support.