I wonder what kind of other mechanics are gonna be included, maybe even take techniques from other games or abilities
Fuck it give my man an Install
Likely stuff like Rush/Special meter and whatnot. The MC did mention "special moves" in this chapter, and I believe we also saw that queen's guard perform a special move as well.
I wouldn't even be surprised if Tekken "wave dashing" will be a thing, derp.
The story hasn't also explored i-frames (if it's even a thing), high-mid-low attacks that bypass high/low guards....
Heck, the simplest thing: Combos, weren't even brought up, not to mention Launchers.
Hopefully the author won't make it a big thing to slowly reveal, because that's too much of a low-hanging fruit. Making Special Moves more complicated than just "feeling it after you get some hits in", but instead some form of a martial art they have to develop, would be far more interesting.
I.E: In vidjeo games, characters already come with their Supers built-in. But how do you gain one? That'd be narratively interesting.