Regarding VXRAIL

1) The specific licenses needed for using Horizon with VxRail will depend on what you are planning to use as far as desktop management features. I would work with your local VMware account team to understand what licensing requirements are needed.

VxRail is a vSphere Ready HCI appliance which means customers can supply their own vSphere licenses that meet their requirements to then use with the VxRail. Customer's would also be able to have that same flexibility with VDI desktop management software like Horizon. Customers can figure out what their needs are and work with their VMware account team to understand the needed licensing to make that happen. They can then run Horizon on VxRail.

2) The number of desktops per node will be completely dependent on the node configuration. VxRail HW can be configured with many different CPU, Memory, Network, and Storage configuration options. Ultimately we would need to understand what your planned desktop image profile requirements are to determine how many of your desktops can fit on a particular sized configuration. Throwing out any desktops/server numbers wouldn't really be any benefit since there are always assumptions to what the desktop image profile used for the number provided (ie 1vcpu, 1GB memory, 50GB storage capacity per desktop etc).