Disney schedules many of its shows only 2-4 weeks in advance, and for Universal we may even have less notice. There is often a fair amount of uncertainty about specific show times in the future, especially for shows that are not "spectaculars" or parades.
In order to allow people to plan in advance, our Personalized Touring Plan software makes educated guesses about show times. Those are fine for distant planning, but we do not expect them to be perfect. For that reason, we encourage you to revisit your plans closer to your touring dates in order to take advantage of the latest show times, park hours, and wait time forecasts.