In Windows Server 2012 R2 Preview Microsoft is introducing Multi-Tenant Gateway. The GW is easier to setup with VMM 2012 R2 Preview but if you want just to test the GW in a small lab here are two guides that will help you in that:
Both guides are provided by Ramandeep Singh Dhillon from Microsoft.
If you are working in one of those companies that are building IaaS there are two guides from Microsoft to help you with the basics. Check them out:
The Microsoft Private Cloud Fast Track Program is a joint reference architecture for building private clouds, which combines Microsoft software, consolidated guidance, and validated configurations with hardware partner computing power, network, and storage architectures; and value-added software components.
The provide documents can be very useful in designing Private Cloud Solution based on System Center 2012:
If you are looking for self study materials for System Center 2012. Here are 3 link where you can find a lot of links to different materials:
Technodge.co.uk is sharing some free e-books and guides. Here is the list:
Microsoft virtualization App-V 5
System Center 2012 Configuration Manager
Windows 8
Microsoft Deployment Toolkit
Cloud Administrator in Azure World 