If you missed it, here is the notification: the free to play version of the DEAD OR ALIVE 5 Last Round the Core Fighters available on Steam in all regions.
Like the original PlayStation 4 / Xbox One version, this edition also includes a fee free (totally 4: Kasumi, Ayane, Ryu Hayabusa and Hayate) playable characters and stages and if you want more well you have to put some money into it but hey, the basic game now is free.

You can get an extra character until October 31, 2016 – Mila and you don’t need to do anything for it. Just download the game and enjoy the free fighting.