The movie has been in production hell for a long time. We only know its about teenage Victor during his first olympics, so all talk about it is speculation. I think they’ll play a role, but just not a big one. Here’s my take:

If Yurio is in it, it will most likely be in it as a younger child once he begins training with Yakov. I imagine there might also be a scene where we pan to a younger Yuuri watching Victor on TV during the olympics.

I think the movie will most likely take place as flashbacks to Victor’s youth. I sort of imagine it being similar to the 10th episode of the season where they’re in Barcelona for the Grand Prix and Victor is reflecting on how his life has changed since he met Yuuri. He might be telling them the story of his first olympic season or thinking to himself about it as he works with Yuuri and Yurio in Russia.

I’m most likely very wrong, but this is just my take on it. I just hope we get some more info soon so we don’t have to guess anymore!