The Get-Command PowerShell command is used to display all of the commands available in the specified PowerShell snap-in. To display a current list of PowerCLI commands available in the version of Horizon you are working with, use the following command:

Get-Command -PSSnapin VMware.View.Broker | more

VMware has not yet updated Horizon PowerCLI to include support for newer features, such as instant clone desktops, Windows RDS application pools, or cloud pods. When a new version of Horizon is released, in addition to reviewing the product documentation you can run this command to see what, if any, PowerCLI commands have been added.