With the parks and resorts panel tomorrow, I'm just hoping for additional rides/major attractions to be announced. Epcot is really starved for those and they honestly need them to pull the crowds so FP+ isn't as horribly broken in this park then it already is.
Additions are the preference, so Ratatouille is on the right track there.
Overlays/replacements are a little trickier, since the number of attractions is the same so it's not helping there. All I can hope is the replacement is really, really good so it can pull the crowds. GotG will probably do that, not so sure bout' the Play pavilion.
As for Moana, I don't think a splash pad will really pull the crowds.
With what's rumored...
Mary Poppins Carousel. That's a additional ride, I'll take it.
Brazil Pavilion. It needs to have some sort of ride/major attraction as WS is more starved for stuff like that than FW. More shops and food doesn't help here.
Coco in Mexico. It's probably most likely a overlay of GFT, I can see that being a bigger draw because of Coco, but like with FEA that ride and most certainly queue is too small for the crowds and I'd rather have a full blown new attraction/replacement instead.
SSE. Well that's a overlay, -maybe- expanded? Hope it's better than the current version, and this might be a sign of how much of a idea/investment they have with the park.
Imagination...
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If this is announced, this will be the biggest test of them all. It's no secret the original is beloved, as well as the tragic history the ride has. What are they gonna' do to actually fix it? Out of everything rumored, this'll probably have the most eyes on it, and the most pressure.