I've got to admit that I'm absolutely flabbergasted and confused as to what the theme for this additional ride could possibly be. My most recent best guess was a copy of the POTC ride from Shanghai which would have ticked off all of the boxes about what we know (large family friendly E-ticket, possible would need details to be worked out with the partners in China who paid for development/possibly exclusivity, would generate debate over having a different POTC ride in a different park).... but then
@marni1971 indicates that there is not a warter ride being planned, which eliminates that.
Did we definitively rule out Indiana Jones? I'm not sure if it was eliminated, but feel like it was at some point recently. Don't think it would be too controversial of a choice, however, if that were the theme.
So, now I'm thinking more that it is an outside IP. But, if so, I find that absolutely crazy that Disney would spend money to license an outside property when they have so many underused/unused things in house available. I mean, sure, something like LOTR would be potentially cool for a theme park, but Disney has their own medieval/magic type options they could use in that vein (I mean, we've already mentioned having a villains ride in this thread, for example).
I'm so befuddled and intrigued.