Both Screamscape and Orlando Insider seem to think it'll involve projection mapping similar to USH's opening celebration, citing vast improvements to projection mapping technology between 2010 and 2016. The Orlando version might include fireworks, but I seriously doubt that Hollywood would have a regular fireworks show. If the people living near the park complain about the noise during HHN, I can only imagine the rage that a regular fireworks show would induce, not to mention the impact it might have on any outdoor filming being done at night.