As much as I tried to find a "Vision Instance" for Fusion Applications Cloud, I was not able to to. It sort of make sense that there isn't available to the general public as you would consume SaaS resources.
The only possible option I was able too find is that if you are an Oracle Partner registering an opportuunity to sell Fusion. Then you would have the ability to access a Fusion Vision on the basis of an opportunity to sell.
Other than that, that doesn't exist!
Hope this helps...