Since I do not exactly knows who is in charge of the great resource that is the wiki, I am posting this here.
This will not effect 90% of users as most people do not have IPv6 network access yet. Some very lucky Verizon users get it without special setup. The rest of us who need it, have to set it up our selves.
Ok, here is what seems to be the problem. If you have IPv6 and your OS/Browser support IPv6 and you try to access the site, you will get a server can not be found. This is usually a DNS problem.
Again for most people this is not a problem, but with more ISPs turning on IPv6 in the next few months, it will become more of a problem.