The Walt Disney World resort has released a detailed schedule of 3 Nighttime Shows to ring-in New Years Eve 2018:

Magic Kingdom

Fantasy in the Sky Fireworks
December 30 and 31, 2017
6:30 pm & 11:50 pm

Epcot

New Year’s Countdown Fireworks
December 31, 2017
11:40 pm

Disney's Hollywood Studios

Star Wars: A Galactic Spectacular--New Years Eve Edition
December 31, 2017
12:00 am (Midnight)