The December 2009 park hours have been increased for the remainder of the month. The new hours are available at http://www.wdwmagic.com/calendar.htm
Most notable, from the 26th to 31st, Magic Kingdom opens at 7am with EMH, with closings between 12am and 3am during that time.
Epcot will be opening at 8am from the 26th to 31st.
Studios will be opening at 8am from the 27th to 31st.
Lots of entertainment offerings have been added across the parks, included more SpectroMagic and Fantasmic! performances.