As long as Universal has this ready in time for Star Wars Land and WDW's 50th, they'll be in good shape. They don't need to make any flashy announcements.
I would like to know sooner rather than later if E.T. will close to be used in Super Nintendo World. Since some have said the three main attractions (Mario Kart, DK coaster, Yoshi) can fit into KidZone without using E.T.'s space, I'd like to think it'll be kept as the sole reminder of USF's origins, but if they also want a couple flat rides or a play area, the top execs might pressure Uni Creative to can E.T. so there's more room for what will essentially be Universal's equivalent to Fantasyland.