Not out yet (we are going in May also), but here's what should happen, unless there are some drastic changes:
Dis/MGM -
Stars and Motor Cars parade - Daily 4:00
Fantasmic - Nightly, around closing time. MIGHT be two showings during Memorial Day Weekend.
Epcot -
Illuminations nightly, 9:00.
Tapestry of Dreams ends at the end of this month, and there is no OFFICIAL word about a replacement, though its rumored one is in the works.
Animal Kingdom-
Mickey's Jammin' Jungle Parade, daily, 4:00.
Magic Kingdom
Share a Dream Come True parade, daily, 3:00.
Then it gets tricky...
Spectromagic might only be on Saturday nights in May, though it could have an extra showing or two over Memorial Day Weekend.
Based on last year, Fantasy in the Sky fireworks will run a bit more often, maybe 2 or 3 days per week, including Saturdays. Spectromagic usually runs an hour or two before closing, and Fantasy in the Sky usually runs at closing time.
However, they have been experimenting with different schedules for Spectro and FitS, so really, we just don't know for sure.