There is an artbook of the series available in the Japanese market with tons of info.
Source here:
http://8wayrun.com/t...ry.10498/page-4So far:
Xiba is their son (Leixia is his step-sister), who inherited the Evil energy from Kilik. Xianghua finally met her long-lost father, Kong from Edgemaster. For those who don't know about the history, it was said from her mother that Kong was "dead" and plus Xianghua doesn't know she has a sister who has a sibling relationship with Kilik before SC1 events. Kong was also Seung Mina's teacher as he taught her Ling-Sheng Su Rod during 1. Kong takes Xiba and sworn to protect him.
She's pronounced MIA and was sent to another dimension during the events of 4...
Li Long, the original nunchuku master from Soul Edge/Blade is actually alive and currently living with the newly established Fu-Ma ninja clan. As part of the original storyline, he has a lover named Chie, who is very best friends with Taki, and they have a son. Chie is the new leader of the clan and is the foster mother of Natsu. While not a powerful fighter like Taki due to her gentle personality, Chie has very powerful spiritual energy.
Other info includes the history of Sophitia's family, (already established since Calibur 1) :
Rothion went away to search for his wife after hearing she went missing. 2 years later, he passed away due to illness. Sophitia's brother, Lucius, took over the bakery business (after the father passed away when he found out about his daughter(s) went missing) and was mad at his brother-in-law for keeping the secret about Sophitia's disapperance. He later taught Patroklos the bakery business.
There is a relationship chart, I will explain that later.
There is some stuff about Taki, she still look the same from the sketches. It gave her some info about her position in the clan and her relationship with Natsu.
There is also something happening between Yoshimitsu and Cervantes with Kilik passing through. As for this fight: Mitsurugi Vs. Setsuka:
She managed to break his weapon. He won the fight by punching her in the stomach.