Your guess is as good as mine with this. I have absolutely no idea what SEGA is teasing, but at least we don't have to wait too long to find out. Whatever it is, let's hope it's coming Nintendo's way!
UPDATE - Looks like we have another piece of the puzzle, as this team works with SEGA, and also happens to be teasing something for the same date.
We're excited to share...— Two Point Studios (@TwoPointStudios) November 29, 2017
We'll be announcing our game on January 16th 2018. pic.twitter.com/yHc5qXR55K