Upgrades at Coronado are just like free upgrades at any Disney resort in that they're totally random and tend to happen when you least expect it. We stayed there about a year ago on our Honeymoon and decided that we'd rather intentionally move to the tower rather than hoping to be upgraded from a standard room. We don't regret doing so as we still did not not get upgraded to a better view, despite having booked a standard view in the Tower long before demand was fully back and having a celebration on our reservation. I've heard of it happening, I just wouldn't book a standard with the expectation of getting upgraded.