I don't think Virtue and Moir have done any competition in North America: either one B competition with US participants only (that could have been their downfall) or a Canadian competion with confusing judging regading these two. They might focus on Europe where they will meet competitors who possibly compete at the Olympics and have international judges which could be beneficial for further international competiton.
Regarding the documentary: I like the idea and I since those episode will need some editing, they might have finished filming before the season even started. It comes to the right time as well, boosting them a little for the Olympics (something we have complained about last year). Well, at least I hope they focus on their training process.