If you have an Azure account (possibly through your MSDN subscription) here is the easiest way to get up and running with SQL Server 2016.
First go to the Azure Portal – http://portal.azure.com
Search and find the SQL Server 2016 CTP3 in the Data and Analytics Marketplace in Azure.
My preference is to grab the ISO and build a local VM, or install it on a server in my environment. But if your server infrastructure lives on Azure or you’ve got those MSDN credits to burn, this is a good alternative.