But you will be charged for it because it launches the VM under your Azure account and will be billed as per usage. However you can register for a trail of Azure and then launch the SQL 2016 VM under that.
“Do you want to easily try out SQL Server 2016 CTP2? Sign up for Microsoft Azure, and then go Here to spin up a Virtual Machine with SQL Server 2016 CTP2 already installed. You can delete the Virtual Machine when you’re finished”