On the bottle, it's described as Mountain Dew with a, "blast of artificial gingerbread flavor." They haven't revealed a release date yet. All we know is it'll hit shelves before the end of the year.
This isn't the first holiday flavor they've come up with. It's replacing a cranberry-pomegranate flavor called Merry Mash-Up that they've been selling since 2018. That one's discontinued now.