I think the story will be from start of HNK2 to finish. HNK2 is actually shorter than HNK1, and the story is basically composed of two main arcs, the Gento arc, and the much larger Shura/Asura arc (which also encompasses the Rasho.)

If they manage to add 8 new playable characters, they can fit in all the most important characters such as Falco, Shachi, Han, Hyo, and Kaioh, with the remaining 3 probably have some combination of either Ein, Soria, Jukei, Kaiser, Akashachi, Kuroyasha, and/or Rin.

HNK1 did the You Wa Shock theme remix well done, so Tough boy could get a remix, as well as I Kill the Fight (which I think it also played in HNK1, maybe). Maybe even that cool credits song featuring a girl, I think it was Rin was in the credits animation, that played during the last episodes of the season. I don't know the name of the song, but it's very cool song.
