It’s very unusual for this to happen, and it won’t happen again for another 70,043 years, so don’t wait up. Hanukkah, or Festival of Lights as it’s sometimes called, can start any time between the end of November, like this year, all the way up to the end of December. People who don’t know that often go around saying “Happy Hanukkah” during Christmas because they’re wanting to be inclusive. Unknowingly, they are actually being patronizing to Jews. It would be like a Jew wishing a Christian “Merry Christmas” in the middle of January.
By the way, you will never hear a Jew wish another Jew “Happy Holidays” during the eight days of Hanukkah, even though it would be more correct than it normally would be at either Thanksgiving or Christmas.