Actually this article seems older but I wrote new because it seems that there are not much new information on the topic as many still mainy contribute Xinyi/Xingyi Quan to Ji Longfeng.
I would be interested if anyone heard anything on this clarifying more on that version.
Recently one of Chinese martial arts magazines published an article about a discovery of a new branch of Xinyiquan, related neither to Moslem nor Dai Family. The style is practiced only in a very small community in a small village in Henan Province. Many facts seem to support the thesis that the style is a “living remain” of Yue Fei’s boxing from before Ji Longfeng’s times. For example - one of the rules of that style does not allow to pass the boxing to people with the last name Qin - probably because Yue Fei was betrayed (which resulted in death sentence) by Qin Hui, minister in Song court. The style shows some similarity to other Xinyi branches, but its movements are more simple, methodology of Neigong (internal exercises) is practically non-existent and emphasis is put on practical fighting skills.
Source: http://www.chinafrominside.com/ma/xyxy/xylhhistory.html
Best regards,
Xian