No fireworks, but there will be mardi gras parades and concerts every saturday evening in Feburary.
The only fireworks I've seen during the off season is when the park gets rented out at night by larger corporate events.
Main reason is because of the residential areas to the north and west of the parks. I live north of the park less than a mile. I know how it is. Recently they took out the final explosion (or toned it down greatly) in the fear factor show because of complaints. (It was a hold over from the old wild wild wild west stunt show where it actually made sense.) Personally, I don't mind it, but most of the residential areas to the north were there before the parks were.