According to articles, Yeon will be singing the themesong for a movie called "Duck's Avenge" (鸭子的反击) with Xiao Shen Yang. For those who don't know who Xiao Shen Yang is, he is a comedian from China who rose to fame from the act "Two Person Act". According to the chinese articles, Yeon will be singing the "Two Person Act" with Xiao Shen Yang.
The movie will star famous actors such as Jackie Chan. The movie will start to film in mid-November, it is produced and directed by Jia Zhang Ke and Baek Seung Hoon.
I'm not exactly sure if that will be the themesong or will it be brand new song, as the article is quite confusing. I guess we'll have to wait and see.
Source Credit: http://ent.ifeng.com/movie/
Translation Credit: ST@Yeonic