Perhaps it is time to accept that IPv6 is the wrong answer (or we need to start asking better questions), take the lessons learned from its failure, and start again. The past 10+ years of work on IPv6 nee IPng have taught many lessons about what will and will not work (and more importantly what will be accepted or not).
There are many fundamental problems with the protocol that no amount of marketecture or hand-waving will fix; the least of which is a lack of end-users calling for a v6 address for their toaster/television/mechanical tie rack.
These issue must be addressed, either in IPv6 (not likely), or in IPng-NG :)
So, what would your requirements be for IPng-NG? What "Questions" do you want answered? What problems does v4 have that need fixing? What problems does v6 have that you think should be avoided? This group appears to be one of the best places to ask, what do /you/ want from a IPng-NG?