Does IPv6 have (for example) 'extra features', options, speed, or any good reason to use it if your are already set-up w/ IPv4?
EDIT:
Found this...
Quote:IPv6 implements additional new features not present in IPv4. It simplifies aspects of address assignment (stateless address autoconfiguration) and network renumbering (prefix and router announcements) when changing Internet connectivity providers. The IPv6 subnet size has been standardized by fixing the size of the host identifier portion of an address to 64 bits to facilitate an automatic mechanism for forming the host identifier from link layer media addressing information (MAC address). Network security is also integrated into the design of the IPv6 architecture, and the IPv6 specification mandates support for IPsec as a fundamental interoperability requirement...
http://en.wikipedia.org/wiki/IPv6
Still not sure about any rush to use it.