Considering the third park is a phantom non-entity that still might not be around for another 5 or 6 years... I'll take it in IOA.
And Christmas Land seems like a poor idea to me, because the headliner would obviously be Grinch... so there'd be a Seuss headliner immediately outside of Seuss Landing. In what way does that make sense? Especially because Seuss has a large-ish expansion pad, current lacks a headliner, and hasn't gotten a new attraction in over a decade. I mean, I guess you could argue that Christmas Land would also allow them to introduce Rudolph and Frosty the Snowman... which are both quiet possibly the most bland IPs possible for theme park integration.