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For people wondering, this is the Japanese version. It came out Dec 8th and this is just what their lobby looks like right now. Will need to wait for Korea (no updates there yet) to announce any Christmas events. Japan has nothing as it literally just released.
Edit
Did some searching around and the Japanese are intense.
https://game8.jp/hit - pretty decent wiki already made for a game that's been out less than a week
https://www.youtube.com/watch?v=zQoBe--325o - Hype trailer. Teases Lena but she isn't in game yet
https://itunes.apple.com/app/id1159609537 - iOS link
https://play.google.com/store/apps/details?id=com.nexon.hit.japan - Android link