Aside from the Rivers Of America being drained and altered, and the closure of all of the riverboats and the train for a year, minimum, starting in January, nothing else should be closing to make way for Star Wars Land. Well, except for the delicious Big Thunder BBQ and ranch area. So it would be normal refurbishments happening in both parks, and yeah, they don't announce those very far in advance! Watch the website and the calender will load very slowly, but most refurbishments and closures for installations and removals of overlays are and announced at least a month in advance. The summer season is probably your best bet because they try to get as many people absorbing attractions and entertainment going as possible.
