Hi, CS 4.10 will have IPv6 support in Basic networking with support for security grouping as well.
I will be present at CCC in Miami in May ( http://us.cloudstackcollab.org/ ) and I will give a talk there about IPv6 in Basic Networking. If you are looking in to deploying IPv6 in Basic Networking, please come to this event! I will make sure I have a live demo environment ready in one of our datacenters to show how it works and help you with drafting a design for your own cloud. Another reason to come to CCC in Miami! Register through http://us.cloudstackcollab.org/ See you in Miami! Wido