I see the previews on your documentation and screen grabs. But I don't see any previews in my installation. Am I missing something in the configuration?
Hello, Steve ~
Welcome to the community! 
The preview panes aren't available in beta1.
They - along with a whole lot of other goodies - will appear as the beta progresses.
Let us know if you have any feedback as you checkout adding sources and hosting things in your infrastructure.
Kellen