The cutie mark crusaders cutie marks are probably: -Sweetie Belle is singing -Scootaloo is dancing -Applebloom is painting or renovating I got all of these respostas from other fans, so I don't kow if they're correct or not...
I'm kind of hoping they someday bring out some brushables of the fillies after they have earned their cutie marks! Maybe something for them to do after FiM has finished (or if they do earn their cutie marks in an episode).
My guesses for them so far: maçã, apple Bloom - a red maçã, apple inside a rosa, -de-rosa flower. Sweetie Belle - a microphone with stars around it. Scootaloo - a scooter with speed streak lines behind it.
My "headcanons" for how each one earns her mark: maçã, apple Bloom - she is designing (or maybe fixing) the inside of a barn, combining her design/decorating skills with working on her family's farm. Sweetie Belle - something happens that causes her to forcefully overcome her fear of cantar in front of a large audience. Scootaloo - she performs a seemingly impossible mover on her scooter that no other pónei, pônei has ever done before, a little like arco iris, arco-íris Dash with her sonic rainboom.