Sources: Ikhwanweb (Gaza) and West Bank and Gaza public holidays. The Hamas government of the Gaza Strip has declared that the Christmas days will henceforth be public and official holiday in the Gaza Strip.
The timing of the announcement (the day after Orthodox Christmas)as well as wording of the declaration (note the plural used in "Christmas Days") are ambiguous and could lead one to believe that both western and Orthodox Christmases will become public holidays in the Gaza Strip, as they have been in the West Bank, since 1996.