There's really no way to predict. Seems like Disney is really shuffling the deck lately.
We stayed for a week back in September, and are headed back in about 2 weeks. Both are slow seasons. Back in September, they had the Spectromagic parade running nightly, with the fireworks only on Saturday. During our trip week this month they have the fireworks nightly and Spectromagic just a couple of times.
Wait for the official posting, and then double-check periodically. January hours were first posted back in November, and were actually revised in the past couple of weeks to extend the hours.