New fireworks shows will debut this year as part of both Mickey's Not So Scary Halloween Party and Mickey's Very Merry Christmas Party.
June 3, 2019: The Disney Parks Blog announced that a new fireworks show titled Minnie's Wonderful Christmastime Fireworks will debut as part of this year's Mickey's Very Merry Christmas Party.
April 26, 2019: The Disney Parks Blog announced that a new fireworks show is comign to this year's Mickey's Not So Scary Halloween Party.
Per the blog, "This new show will feature state-of-the-art projection effects, lasers, lighting and dazzling fireworks that come together to tell a not-so-scary story about how anything can happen on Halloween night."
March 18, 2019: WDWNT.com is reporting that Mickey's Not So Scary Halloween Party will see a new fireworks show in 2019 as well as ride overlays to Big Thunder Mountain Railroad, Monster's Inc Laugh Floor and the Tomorrowland Transit Authority Peoplemover.
November 15, 2018: WDWMagic.com user MansionButler84 is reporting that new fireworks shows are under consideration for both the 2019 Mickey's Very Merry Christmas Party and Mickey's Not So Scary Halloween Party.
The shows will reportedly be updates to the current nighttime parade, Happily Ever After.
November 14, 2018: WDWMagic.com user tcool123 posted a Disney survey that asked if the guest would prefer to see Happily Ever After over Holiday Wishes.