The weeks of Christmas and New Years are some of the busiest days of the year, expect park hours to be adjusted significantly as the dates draw closer, historically MKP has been open from 8am to midnight every day that week (with both Morning and Evening EMH sprinkled in on multiple days) and Epcot from 9am to 10pm (BOTH FW and WC), expect closings of 1am or later on NYE at BOTH MKP and Epcot. Be prepared for heavy crowds, long waits, and the possibility of phased park closures due to capacity.