The IETF is committed to the deployment of IPv6 to ensure the
  evolution of the Internet.  However, the IPv4-only components of the
  Internet must continue to operate as much as possible during the
  transition from IPv4 to IPv6.

  The Working Group will standardize technologies that facilitate the
  graceful sunsetting of the IPv4 Internet in the context of the
  exhaustion of IPv4 address space while IPv6 is deployed.  These
  technologies will likely be less optimal than equivalent technologies
  for IPv6-only and dual-stack networks.  The Working Group focuses primarily
  on IPv4 protocols to facilitate IPv4 sunsetting.

  The Working Group may work on fixing security bugs in existing
  IPv4-specific protocols but is not chartered to add new security
  functionality to those protocols.

  The working group will provide a single venue for the consideration of
  IPv4 sunsetting, while ensuring that any such technologies do not
  impede the deployment of IPv6 and do not duplicate functions and
  capabilities already available in existing technologies. Therefore,
  along the lines of draft-george-ipv6-support, before the working
  group adopts any technology, it must:

  1) describe the problem to be solved and show that there is widespread
     demand for a solution
  2) demonstrate that the problem can not be solved with existing
     technologies
  3) provide a description of the proposed solution along with its
     impact on current IPv4-only use and justification that it does not harm or delay the deployment of IPv6

  These steps will likely be described in the form of a use case and
  requirements document.

  Only after the above mentioned steps have been completed and the
  results accepted by the community will the IETF consider adding new
  work items to the Working Group charter. This new work may include
  protocol specifications.

  The work spans over multiple IETF areas including Internet,
  Operations, Transport and Routing. Therefore, cross-area coordination
  and support is essential and required. This working group focuses IPv4-specific work within the IETF into a single group in order to minimize IETF work on creating and standardizing new IPv4-specific features, IPv4 life extension technologies, and IPv4 to IPv6 transition mechanisms whose primary focus is on IPv4. The scope of work on these items is limited to the minimal amount necessary to support continued operation of the Internet until IPv6 is fully deployed.

  The initial work items are:
  * CGN port allocation and address sharing methods
  * Gap analysis of IPv4 features to facilitate IPv4 sunsetting
  * Provisioning methods to signal a dual-stack host to disable the use of IPv4

Goals and Milestones:
  Dec 2012 - CGN port allocation and address sharing methods
  Jun 2013 - Send gap analysis on IPv4 sunsetting to IESG
  Sep 2013 - Provisioning methods to signal a dual-stack host to disable the use of IPv4