I've completed the (hopefully) final updates to the IP Tunneling design prior to going to PSARC. The most significant addition to the document since it was last reviewed is the addition of a section describing the interaction with zones (section 10).
The document has also undergone overall house-keeping to bring it up to date with the implementation. http://www.opensolaris.org/os/project/clearview/iptun/iptun-design.pdf -Seb
