VMware has released special licensing for the vSphere 5 product if you're going to use the Hypervisor for VDI environments. The licensing is a lot easier to follow. It's a simple $6,500 per 100 concurrent desktops. This product is called "vSphere Desktop". The hypervisor itself will have all the standard functionality of vSphere 5 but you're only supposed to be allowed to run desktop OSes.
The only problem I have is I suppose you'll still have to buy regular vSphere 5 licensing for your infrastructure servers. For example, if you're running XenDesktop, you'll need to run your Citrix Provisioning Servers, XenDesktop Brokers, & Web Interfaces on normal vSphere5.
I'm guessing this whole thing is going to be an honor system, but I think VMware is making things more complicated than need be. For more information on this "vSphere Desktop" product & licensing. Click Here.
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