Nvidia has released its first preview driver that includes OpenGL 4.4 ICD (installable client driver), the Geforce 326.29. Featuring support for Geforce GTX 400 series and above as well as Quadro K600 and above graphics the new driver brings a number of OpenGL extensions and features.

Available for Windows 8, 7, Vista and XP as well as Linux platforms in both 32 and 64-bit flavors, the new driver brings OpenGL 4 and OpenGL 3 extensions as well as new ARB extensions for Geforce 600 series and above graphics cards. It also includes a couple of NV extensions including NV_blend_equation_advanced, NV_bindless_multi_draw_indirect and NV_gpu_program5_mem_extended.

As always, the new Geforce preview driver with OpenGL 4.4 can be found at the link below.
Source: Nvidia.com.