Introduced last month was the ability to overclock Intel graphics under Linux
while presented hours ago is a new Intel Linux kernel driver patch to provide better GPU overclocking support.
The patch by Intel's Ben Widawsky allows for the user to set the overclocking frequencies via sysfs rather than just the UEFI/BIOS. Additionally, the patch takes care of another overclocking-related fix plus printing the maximum overclocking frequency via sysfs and debugfs.
This latest patch can be found currently on the intel-gfx list
and will presumably be merged into the Linux 3.10 kernel.