This would make the most sense. Because, the more this sits and you get a chance to think about it - their hardest part is figuring out the logistics, much more so than animatronics and ride mechanisms.
Things like:
Crowd management- I'm assuming they've got to use some additional space somewhere- look how just the M&G went, earlier.
Plus, you have to take into account/plan for crowd and line management for events like F&W
FP+: is it a ride and/or an M&G? Are they really considering pouring guests off of a ride into an M&G...??
WS hours of operation - I mean, if "Frozen" is anywhere near as popular in 2016 - are you going to open WS at 11 - especially when the ride and M&G first premier? How do you manage that? Short term, long term, and the demographics of the change. This is not trivial not trivial
And, there's from Oct 5th until sometime in 2016 to deal with the capacity hit: daily in-Park and FP+ ressies.... and so many other things
Look, I've been very up front with how much I don't like this. So feel free to call me subjective. Because I am on this one.
But, the more you look at this, and how they've botched the announcement...
It just reeks of a "not fully baked" plan from so many angles - tactical and strategic