A quick note.. since the world still seems to be up in arms over the $120 theoretical ticket price..
The ticket is still only available as a 3-day ticket, but if you look at the various price options and ticket-builds (2 parks versus 3 parks, 2 day versus 3 day) then you come out to about a $40-60 difference to have access to Volcano Bay or not have access on what is otherwise the same ticket.
Which seems much more reasonable for the ticket price as a stand alone. I'm betting it'll be about $40 for an add-on to any ticket and $60 as a stand alone.