I've forwarded this thread to the product manager. I hope you can receive an update soon.
we have support for Hyper-V listed as an item for a future version.
The answer to your question why McAfee does invest in one solution but not in the other. Move lives from supporting as many virtual platforms as possible just through the nature of what MOVE is. Web Gateway focus is to be an appiances based solution with an option to deploy w/o the need for hardware, which is VMWare. Decisions like this one need to be based on good judgement and this judgement is based on factual data. To give you an example: http://hyper-v-backup.unitrends.com/hyper-v-gaining-share-vmware/ VMware's marketshare is still above 50% with others closing in. This is the reason why we added it to the plan for the product as an item to look into.