I hope this will make some things more clear about the IPv6 status. x.org just claims that R6.7 will support it. I wasn't able to access their cvs, possibly my fault) so im do not know their real status.
xfree86.org placed 4.3.0 in features freeze the 30th of Novemeber so basically it means that IPv6 will not be included until a 4.3.x (or whatever it will be called) release and the actual code (except from libxml2) does not have ipv6. At this point in time I would suggest to proceed with inclusion and be ready to merge with 4.3.0, test and send upstream. More than rejecting the patches I do not see any other simple solution in a short term. Of course we can just wait and see but of course the final decision is up to Branden. Thanks to everyone for the suggestions. Fabio PS I was not able to search too much on INRIA and on the university of Paris (as suggested) for the simple reason that 99% of the pages I found are in french. Sorry but it is not my language. Of course I will be glad to receive information if someone can do that for me.