If your IPv6 strategy is to delay implementation as long as you can, you still must address IPv6 security concerns right now.
ipv6 - News, Features, and Slideshows
The world is almost out of IP addresses--or at least it's almost out of the IPv4 addresses that IT admins and users are most familiar with. Fortunately, IPv6 has been developed to exponentially expand the pool of available IP addresses while also providing a few other benefits.
The most popular Web sites are under increasing pressure to add support for IPv6, a long-anticipated upgrade to IPv4, the Internet's main communications protocol.