When you build SQL Servers in your data center, and you license the host with Enterprise Edition, you get the ability to run as many virtual SQL Servers as you want on that hardware.
In the cloud, though, you haven’t had that luxury. In the past, with Azure VMs and Amazon Web Services’ EC2 VMs, you’ve had to license each individual VM. You weren’t able to guarantee that your VMs all lived on the same host, so you had to pay through the nose.
Soon, Amazon is fixing that with the ability to get your own EC2 Dedicated Hosts.
This is gonna be huge. You can license one AWS host, and then run as many SQL Server VMs on there as you want. Use the same cool AWS management tools, and dramatically cut your costs.
No word on release dates or pricing yet.