I think they've been adjusting it a lot and fulfilling contracts, the recent early closings have been Gradventure/Grad Bash, where as the OI buy out is after park close at 9pm tonight. Hell, I even saw a lunch buy out of the Groove/Antojitos area of CityWalk this past trip (with Bumblebee none the less!) The parks have been open 8/9am to 9pm pretty frequently with early entry, which is the same as Epcot and usually more than DHS.