Blizzard has added some content into Overwatch which wasn’t meant to be opened until closer to Christmas but data miners on Reddit found and shared them. That content is new audio files including a new Christmas theme and voice lines for some of the heroes.
We expect there to be some limited availability hero skins added to celebrate the most wonderful time of the year. Mercy as a tree-topping angel perhaps? Roadhog as Santa? Junk Rat as Rudolf perhaps? We aren’t sure but we are pretty confident that Blizzard has something planned to celebrate the holiday season.
Along with the new theme, other audio files that aren’t currently used in the game were found. The majority of files appear to revolve around Sombra but there are some new ones for other characters too.