[Update]: Mr. X Nightmare DLC has now arrived and so far it's looking like it's quality stuff!

In order to spice things up, Streets of Rage 4 developer Lizardcube has now announced the very first piece of DLC - Mr. X Nightmare. Once it arrives later this year Mr. X Nightmare will bring with it brand new characters (including Stage 4 boss Estel Aguirre), a new survival-focused game mode, an assortment of new weapons and moves to help customize your playstyle, and naturally, a whole bunch of new music to jam out to.

Best of all, the Mr. X Nightmare DLC will be accompanied by a substantial free update. While the details are still few and far between, you can expect to see new character palettes, a training and tutorial mode, a new Mania+ difficulty level as a nice challenge for veterans, and as is tradition, a whole host of gameplay and balance tweaks.

As for what exactly all of this will look like in action, that you can find out through the newly posted announcement trailer. Have a gander:

Once more information becomes available, ideally alongside a release date, I'll make sure to let you know. Until then, you can read a tiny bit more about the Mr. X Nightmare DLC over at Steam.