In August 2005 the White House issued a policy "... directing all Federal government agencies to transition their network backbones to the next generation of the Internet Protocol Version 6 (IPv6), by June 30, 2008." That would be this Tuesday. The requirements in that directive were not especially difficult, and it appears that it will be met. Agencies are not required to move their traffic to IPv6 at this stage, just to demonstrate that they can properly handle IPv6 traffic on their backbones. So it's more an issue for routers than for servers, for example. There are no requirements in place for further adoption of IPv6. Such requirements and such adoption are inevitable for the next administration though, as the depletion of the IPv4 address pool is scheduled to happen on its watch.