I am sure it will be shown during the ususal Easter Weeks. That is the 2 weeks before Easter or it may be the week b4 and after. Someone else will know for sure.
We go in that time period nearly every year, and we always have been able to see the MK fireworks on Saturday nights. They often add a night or two during the week if they anticipate bigger crowds. MK is packed on those Saturdays, so we like to spend the day at Epcot & monorail over in the early evening to catch Spectromagic & the fireworks. It's a great time of year to be at WDW---125 days to go!!