As soon as Windows Server 2012 went into General Availability MVA released a fair amount of videos to cover the new functionalities. So watch and learn for free:
Windows Server 2012: Technical Overview
Server Virtualization Module
Networking Module
Storage Module
Identity and Access Module
Virtual Desktop Infrastructure Module
Web and Application Platform Module
Windows Server 2012: Server Virtualization
Virtual Machine and Scale Mobility Module
Windows Server 2012: Storage
Storage Spaces Module
SMB 3.0 Module
File System Enhancements Module
Windows Server 2012: Networking
Managing Network Infrastructure Module
IP Address Management (IPAM) Module
Hyper-V Network Virtualization Module
Windows Server 2012: Management & Automation
Standard Based Management with Windows Management Framework Module
Multi-Server Management with Server Manager Module
You can also logon to MVA and find the track there.