Like it or not now we’re in the tipping point of moving to the IP v6. IP v4 has been already exhausted to it’s maximum level.
Still we’re still far away from adopting to IP v6 due to many reasons. Some administrators don’t want to even think about going through the learning curve of IP v6 and introduce to their system. Apart from that they also overlooking the trends in the market about this transition.
Never the less Microsoft with Windows 2008 R2 and Windows 7 introduce some cool technologies you can use with the help of IP v6 (Direct Access, NAP enhancements). To move to IP v6 companies can adopt many transitions methods as mention here.
The document has been written in very friendly manner with the introduction of IP v6 basics and how it can be co-exist and deploy securely. IP v6 has lot to offer so we have to unleash it and control it in a secure manner. The authors has taken careful considerations about this part.
Apart from that Microsoft has done very good job of providing comprehensive documentations and support on this adoption. You can find more information about this which is available in dedicate section in TechNet. Some more resources over here.