During a press conference at the 2015 World Figure Skating Championships in Shanghai, they said a secret new "trick" was in the works for this season. During the Stars on Ice tour, they decided to post a video revealing what they were referring to: a throw quadruple lutz, an element never performed in competition.
"It is too good to keep secret," Radford said on Facebook.
Duhamel explained that as the throw triple lutz became easier and easier to land, she and Radford wanted to take things up a notch.
"We told Richard we wanted to try it during Stars on Ice and he agreed, and so did Bruno," Radford said. "So, during our shows, we decided to practice it. We learned it in two days without ever having a lesson. Now, it's better than the quad throw salchow was last summer, when we had just learned it. Doing a quad throw is not riskier for us than doing a triple throw."
http://web.icenetwork.com/news/2015/08/11/142457472