Intel recently released an updated graphics driver for Ivy Bridge processors sporting either HD 4000 or HD 2500 GPUs. The new 220.127.116.1171 (or 18.104.22.168.3071 for those running a 64-bit OS) driver features several under-the-hood optimizations to reduce CPU overhead and improve the driver architecture itself.
The driver architecture improvements have also led to improved game performance. Intel claims up to 10% better performance in StarCraft II, Batman: Arkham City, and World of Warcraft: Mists of Pandaria (among others).
The chip giant also notes that the new driver supports OpenCL 1.2 for GPGPU calculations. The graphics driver update is only for Ivy Bridge hardware, and is compatible with Ivy Bridge hardware and both the 32-bit and 64-bit versions of Windows 7 and Windows 8. If you are running Intel's Driver Update Utility, you should get the new driver automatically.
Otherwise, you can grab the new driver from the following link, depending on your OS.
Unfortunately, these drivers are generic Intel HD graphics drivers. If your OEM computer is running Windows with an OEM-customized version of Intel's drivers, you are out of luck. You will need to wait for your OEM to update its driver package in order to take advantage of the performance improvements.