At the IETF67 6lowpan WG meeting, it was decided to work on the new header encoding proposal for up to two months and then reach a decision, based on the following milestones:
- Finish full spec within a week (Nov 15)
- Significant review by Nov. 22.
- Get two implementations within a month.
- WG Last Call Dec 8th.
- Submit (old or new) by early January.
The full spec is at: format-d1115.txt
Review and discussion is now needed on the 6lowpan WG mailing list.