I agree with Orlando Vic- it's still a bit early for event annoucements. In the past, there's been a big New Year's Eve party downtown and fireworks in some of the cities around Orlando. Not sure what's being planned for this year yet.
And yes, the theme parks will be crowded. I was in Epcot on New Year's Eve several years ago. The park was quite busy, but they did have a good fireworks show at midnight.
