Changelog can be found on the TechpowerUp page. Biggest update might be the ability to increase OCP through the GPU-Z software.
TechPowerUp rolled out a new version of GPU-Z, the popular graphics sub-system diagnostic utility. Version 0.4.3 comes with a load of new features and stability updates. Highlights include full capability to monitor voltages on the GeForce GTX 480, a new method of voltage monitoring which extends support for many ATI and NVIDIA graphics cards, support for the upcoming GeForce GTX 465, GT 320M GT 335M, ION variant, GT 340, Tesla C2050, Tesla M2050, and other Quadro series GPUs, new display languages including Spanish and Hungarian, among other stability updates.