I think this is the latest. I install it couple of weeks ago.
PowerCLI Version
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VMware vSphere PowerCLI 5.1 Release 2 build 1012425
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Snapin Versions
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VMWare AutoDeploy PowerCLI Component 5.1 build 768137
VMWare ImageBuilder PowerCLI Component 5.1 build 768137
VMware License PowerCLI Component 5.1 build 669840
VMware VDS PowerCLI Component 5.1 build 1012428
VMware vSphere PowerCLI Component 5.1 build 1012428