It’s about a somewhat downcast Rainbow Dash trying to make the Wonderbolts, and after repeated letdowns she gives up. However she finds out a biographical motion picture of a famous Wonderbolt is going to be filmed, and she decides to try something new. So she’s essentially doing the closest thing to being a Wonderbolt… pretending.
I don’t know, though it might interest someone who’d like to pick it up and do something with it.
Help fund the $15 daily operational cost of Derpibooru - support us financially!