This falls into the "We'll see if this
hybrid engine works" category. Last fall a bunch of big tech players said they will give
IPv6 a trial run.
That run takes place tomorrow.
Google,
Facebook and
Yahoo are among those giving IPv6 a trial run. Guessing is that most companies and most users will never notice as those that run into IPv6 issues will default back automatically to IPv4 But then again, you never know.