You read it right, Tatsujin will release on Steam next week!
The store page is open now, and the DLC will release around 17:00 PST.
We'll have a celebratory sale and a contest too!
Contest prizes:

How to participate
Simply play Time Attack's Stage 1 at any time during the contest and record a score online.
Only new or updated scores recorded during the contest will be valid, but multiple entries/characters are acceptable.
Rules
Duration: Feb 14th ~ 28th 11am (Japan time.approx 13th 5pm ~ 27th 6pm PST)
Options: default settings only
Character: Take your pick!*
*prizes may vary depending on character used.
More details next week!
https://store.steampowered.com/app/834040/Game_Tengoku__TATSUJIN/
The DLC features the Super Fighter from Tatsujin/Truxton, playable in Arcade Mode +, two new tracks for Time Attack (original arcade stage 1 theme and a remix) and the Sound Test and a new entry into the Data Mode HD menu so you can learn more about Tatsujin/Truxton from the over-enthusiastic Yuki Ito (voiced by Kumiko Nishihara).
In order to faithfully re-create Tatsujin's play experience, the Super Fighter plays differently from the other characters: powerups cycle between three colours, the colour coresponding to a weapon type and options are added automatically at a certain power level. More info in the manual, here!