If you're interested in finding out more about new networking technologies and features, check out the topic What's New in Networking for Windows Server Technical Preview.
You'll find information about new features for DHCP, DNS, IP Address Management (IPAM), and Windows Server Gateway.
Note: Windows Server Gateway is also called the Routing and Remote Access Service (RRAS) Multitenant Gateway, and the new feature is Generic Routing Encapsulation (GRE) Tunneling.
Also available is information about Network Controller, which in combination with System Center allows you to manage both physical and virtual network switches, routers, multitenant gateways, and more.
For a wider view of the new product beyond networking, see What's New in the Windows Server Technical Preview.
And if you're interested in downloading the technical preview, head over to Windows Server Evaluations.