I do know the exam was based on 5.0, and was being updated to make it 5.x (all questions would have the same answer for either 5.0 or 5.1), but I do not know when the updated exam will be available.
I've already explained that the certification is for the major version only, so "vSphere 5" is what you'll see on your certificate and VCP5-DV is the certification short title.
Go with the current blueprint as available via the VCP5-DV page: http://www.vmware.com/go/vcp