GSD is short for Gong Shou Dao. It is derived, from what I understand, primarily from Tai Chi, but incorporates other martial arts. Jack Ma (the star of the film) is working alongside Li to get Tai Chi into the Olympics.
From Jet Li's Facebook page:
"This is the story of my good friend Jack Ma as a Taiji Master. I am also the Executive Producer for this short film.
Other martial art forms are showcased by Donnie Yen, Wu Jing, Tony Jaa, Jacky Heung, Asashoryu Akinori, Zou Shiming, and Natasha Liu. Action master choreography by Sammo Hung, Yuen Woo-Ping, and Tony Ching. I hope all of you will like it."
